How to Clean Old Tiles and Grout Properly: A Practical UK Guide

Start with the gentlest suitable method. Old tiles often need careful cleaning, not aggressive scrubbing.

Old tiles can look dull long before they need replacing. A film of grease, soap residue, limescale, dirty grout or worn silicone can flatten their colour and make an otherwise tidy kitchen or bathroom feel tired. The encouraging part is that a careful clean and a few small repairs can often produce a noticeable improvement for considerably less than a new tiled surface.

The right method depends on what the tile is made from. Glazed ceramic and porcelain are generally forgiving, while marble, limestone, travertine, encaustic cement and some unglazed tiles can be permanently marked by acidic cleaners or harsh scrubbing. If you are unsure, identify the material before reaching for vinegar, bleach or a strong descaler.

Important safety note: never mix bleach with vinegar, limescale remover, ammonia or any other cleaning product. Follow the product label, ventilate the room, wear suitable gloves and keep children and pets away until the area is rinsed and dry.

Choose the method that suits your tiles

Surface	Safe starting point	Avoid unless the manufacturer approves it
Glazed ceramic	Warm water and a small amount of pH-neutral detergent	Wire brushes, abrasive powders and undiluted acids
Porcelain	Vacuum or sweep, then use a suitable neutral cleaner	Products that leave waxy residue; harsh scourers
Natural stone	A cleaner specifically labelled for that stone	Vinegar, lemon juice and acidic limescale removers
Encaustic or cement tile	Manufacturer-approved pH-neutral cleaner and minimal water	Acids, bleach and aggressive scrubbing
Grout	Neutral cleaner and a small nylon grout brush	Metal brushes, flooding and mixing chemicals

Before you begin: test your chosen method on a hidden corner and allow it to dry. A wet patch can appear darker and hide damage that becomes visible later.

A realistic low-cost cleaning kit

• Microfibre cloths: roughly £3–£7
• Soft nylon brush or old soft toothbrush: roughly £2–£5
• pH-neutral tile cleaner or mild washing-up liquid: roughly £2–£8
• Two buckets or bowls, one for cleaning solution and one for rinsing
• Rubber gloves: roughly £2–£5
• Optional grout pen, replacement silicone or sealer only after checking suitability

You may already own most of this kit. Avoid buying several specialist products at once. Start gently, assess the result after the surface has dried, then spend only where the remaining problem is clear.

1. Identify the tile and check its condition

Look at an unused tile, an old invoice or the information left by the installer if available. Glazed ceramic usually has a smooth, sealed face, while natural stone often shows variation and pores. Porcelain may be glazed or unglazed. Patterned cement tiles and older quarry tiles need particular care because the surface may be porous or previously sealed.

Also check for loose tiles, hollow sounds, cracked grout, missing sealant and persistent damp. Cleaning cannot repair movement behind a tile. If several tiles are loose, cracks keep returning or the wall feels damp, investigate the underlying cause before disguising it cosmetically.

2. Remove loose dust before adding water

Sweep or vacuum the area using a soft floor head. Pay attention to corners and grout lines, where grit collects. Adding water too early turns dust into grey slurry and can make textured tiles harder to clean. On walls, use a dry microfibre cloth to remove loose dust from the top down.

3. Wash with the gentlest effective solution

For many glazed ceramic or porcelain tiles, warm water with a small amount of suitable neutral cleaner is enough. Too much detergent can leave a sticky film that attracts more dirt, so follow the stated dilution rather than pouring freely.

1. Work in a small section so the solution does not dry on the surface.
2. Apply it with a cloth or soft mop and allow only the contact time permitted on the label.
3. Agitate textured areas gently with a soft nylon brush.
4. Rinse with clean water and change the rinse water when it becomes cloudy.
5. Dry with a clean cloth to prevent streaks and reveal the true result.

4. Deal with kitchen grease without scratching

Kitchen splashbacks often look dull because airborne grease has trapped dust. A properly diluted degreaser that is labelled safe for your tile may help, but begin with warm water and a little washing-up liquid on glazed ceramic. Let the solution soften the film briefly, then wipe rather than scrape.

Do not use a knife, metal scourer or abrasive cream on a glossy glaze. Around a hob, switch off appliances and let surfaces cool fully before cleaning. Keep liquid out of sockets, switches and appliance controls.

5. Clean grout in controlled sections

Grout is usually more porous than the tile face, which is why it darkens first. Apply a grout-safe cleaner to a short length, agitate lightly with a small nylon brush, then rinse. Scrubbing harder is not always better: worn or powdery grout may break away.

A paste of bicarbonate of soda and water is often presented as suitable for every tiled surface. It is mildly abrasive, however, and may affect polished stone, decorative finishes or some sealers. Use it only if the tile and grout manufacturer permits it, and test first. A purpose-made neutral grout cleaner is the safer starting point when the material is uncertain.

If a grout line stays dark after it is clean and completely dry, it may be permanently stained. A grout colourant or pen can improve an intact line, but it should not be used over damp, mould, loose grout or soap residue.

6. Treat limescale carefully

White, chalky deposits around taps and shower screens are often mineral scale. Acidic products dissolve scale, but the same chemistry can etch marble, limestone, travertine, cement tiles and some grout or metal finishes. Do not assume vinegar is harmless because it is a household ingredient.

On acid-resistant glazed ceramic, use only a product labelled for the surface, protect nearby fittings and follow its instructions. On natural stone, use a stone-safe product or ask the supplier. Regularly drying wet areas with a squeegee or cloth is cheaper and safer than repeatedly using strong descaler.

7. Know the difference between surface mould and a damp problem

Small marks on silicone or grout may result from persistent condensation, but recurring growth can also point to poor ventilation, a leaking fitting or water getting behind the finish. Clean only with a product suitable for the surface and use it exactly as directed. Never combine products in an attempt to make them stronger.

Reduce moisture by using the extractor fan during bathing and for a period afterwards, wiping down the shower and allowing towels to dry. If mould covers a large area, returns quickly, accompanies a musty smell or appears beside a leak, deal with the moisture source and consider professional advice.

8. Replace failed silicone and repair damaged grout

Cleaning cannot restore silicone that has separated, cracked or become stained through its full depth. Failed sealant around a bath, shower tray or basin can allow water into hidden areas. Remove and replace it with the correct sanitary sealant only when the joint is clean and thoroughly dry, following the product’s curing time.

Small isolated grout gaps can sometimes be raked out and repaired with matching grout. Widespread cracking, movement or loose tiles needs investigation rather than a quick surface patch. If you rent, report damaged grout, sealant or suspected leaks to the landlord or managing agent before altering the surface.

9. Improve the finish without using wax or polish

Once clean and dry, glazed tiles should not normally need furniture polish, oil or wax. These can create a slippery floor, attract dirt and make later maintenance difficult. The best “shine” usually comes from removing detergent residue and buffing with a clean, dry microfibre cloth.

Some porous tiles need sealing, but sealing is material-specific. A sealer does not make a dirty tile clean, and applying the wrong one can cause patchiness. Confirm the tile type, strip incompatible residue if required and follow the sealer manufacturer’s preparation and reapplication guidance.

Common mistakes that make old tiles look worse

• Using too much detergent: residue dries into a dull film.
• Reaching for vinegar automatically: acid can damage stone, cement tiles, grout and fittings.
• Mixing cleaners: this can release dangerous gases or cause unpredictable reactions.
• Scrubbing with metal: wire brushes and scourers can scratch glaze and damage grout.
• Soaking the floor: excess water can enter damaged grout, joints or edges.
• Covering a moisture problem: grout pens and fresh silicone will not cure a leak.
• Judging while wet: allow the area to dry before deciding whether another treatment is needed.

A simple maintenance routine

For floors, remove grit regularly and damp-mop with the correctly diluted cleaner when needed. For shower tiles, rinse away product residue, use a squeegee and ventilate the room. Wipe kitchen splashbacks before grease builds into a stubborn film. Keep a note of the tile and sealer products used so you do not have to guess next time.

If the surrounding room still feels tired after cleaning, small changes can do more than another harsh treatment. A fresh bath mat, properly sized rug, neat sealant line or warmer lighting can improve the overall impression. See our guides to cheap flooring ideas that do not look cheap and making a rental kitchen look more expensive without renovation.

When cleaning is no longer enough

Consider repair or professional assessment if tiles are loose, cracks recur, grout is crumbling across a large area, staining rises from beneath the surface or there are signs of a leak. Deep scratches, etched stone and worn glaze cannot be cleaned away. In those cases, replacing a few matching tiles or getting specialist stone refinishing advice may cost less than experimenting with increasingly strong chemicals.

Frequently asked questions

Can I use vinegar on old tiles?

Not as a universal cleaner. Vinegar is acidic and can etch natural stone and affect cement-based materials, grout or nearby finishes. Use it only where the surface manufacturer explicitly allows an acidic cleaner.

Why do my tiles still look cloudy after cleaning?

The common causes are excess detergent, dirty rinse water, hard-water residue or a product that is not suitable for the finish. Rinse a small test area with clean water, dry and buff it. If cloudiness remains, identify the tile and any existing sealer before applying something stronger.

Can I make old grout white again?

Sometimes, but grout may be naturally coloured, permanently stained or physically worn. Clean gently and let it dry first. If it is sound but discoloured, a compatible grout colourant may help. Loose, cracked or damp grout should be repaired instead.

Should old tiles be sealed?

Only if that particular tile or grout requires it. Many glazed tiles do not need a surface sealer, while porous stone and cement products often do. Check the manufacturer’s guidance or seek advice from a tile specialist before applying one.

Editorial note: Prices are approximate UK retail ranges and vary by product, retailer and location. Always follow the tile, grout, sealer and cleaning-product instructions.