Slate Cleaning and Restoration

Slate that was once rich in colour can turn dull, patchy or stained over the years. Professional slate cleaning can lift dirt, grease, algae and old sealer and bring the stone back to life. SlateTiles.co.za is a free quote service. Fill in one form and we pass your request to independent cleaning and restoration specialists in your area, who quote you directly. There is no fee and no obligation. We do not clean or sell products ourselves.

What cleaning and restoration involves

Restoration goes further than a wash. A typical job includes some of these steps:

sweeping and degreasing, to remove loose dirt and oil
scrubbing with a pH-neutral cleaner and a rotary brush
stripping old, flaking or yellowed sealer
treating algae, mould and white salt marks
rinsing, drying and sealing again

Avoid acid on slate. Acid-based cleaners can etch the surface and leave permanent dull marks. Good slate cleaning relies on neutral or mild alkaline products. Pressure washers can also damage soft slate and blast out grout, so ask how hard the water pressure will be.

Common problems on slate

Slate hides dirt well, so problems often go unnoticed until the stone looks tired. Typical issues are:

grease and cooking marks on kitchen floors
green algae on shaded, damp patios and steps
efflorescence, the white salt bloom that comes from moisture in the screed
cloudy, flaking or uneven old sealer
grout stains and cement haze left after tiling

Rustic and multicolour slate shows copper, gold, rust and green tones from iron and other minerals. Cleaning often brings these back. Black and charcoal slate can look grey and chalky when it is dry, and a clean followed by sealing usually restores the depth of colour.

What to check before you hire

Slate is a natural stone, so the method matters. Ask the specialist:

what cleaner they use, and whether it is pH-neutral
whether they will test a small hidden area first
how they handle old sealer, and what they will put back
how they protect skirtings, plants and nearby surfaces
how they deal with efflorescence that keeps returning

If salt bloom returns after cleaning, the cause is usually damp. The moisture source should be fixed, or the job will need repeating. Ask what happens to the water and residue, especially on patios next to lawns, pools and drains.

What affects your quote

Specialists price slate restoration from what they see. Help them by giving:

the area in m², and whether the slate is inside or outside
the finish, such as cleft, honed or tumbled
how long since the slate was last cleaned or sealed
the type of problem, such as grease, algae, salt or old sealer
access and water supply, especially for patios
whether you want re-sealing included

Clear photos help. Include a worst patch and a general view. If the slate is inside, say what is on the floor now, such as wax, polish or a floor sealer, as this changes the method.

Comparing quotes for slate cleaning and restoration

The lowest figure is not always the best deal. When your quotes arrive, check:

Scope: exactly what is included, from surface preparation and materials to cutting, sealing and clean-up.
Materials: the slate, adhesive, grout, sealer or fixings allowed for, and who buys and delivers them.
Timing: when the work can start, how long it takes, and curing or drying time before the area can be used.
Guarantee and terms: any workmanship guarantee, deposit, payment stages and how long the price holds.

What to include in your request

State the area in m² and whether the slate is indoors or outdoors.
Describe the problem, such as grease, algae, white marks or old sealer.
Say when the slate was last cleaned or sealed, if you know.
Mention whether you want re-sealing done in the same visit.
Attach photos of the worst area and a wide shot of the whole surface.

Frequently asked questions

What should I use to clean slate tiles?

Use a pH-neutral stone cleaner with a soft brush or mop and rinse well. Do not use acid, vinegar or harsh bleach, which can etch slate and damage sealer. For heavy staining or old sealer, a specialist with the right machines is usually the safer choice.

Can old, dull slate be restored?

Often yes. Cleaning, stripping old sealer and re-sealing can bring back much of the original colour. Deep scratches, chips and cracked tiles are not fixed by cleaning, and may need repair. A specialist can judge the condition from photos or a site visit.

How do I remove white salt marks from slate?

Those white marks are usually efflorescence. Dry brushing and a suitable cleaner can remove surface salt. If it keeps coming back, moisture is moving through the floor or wall behind, and that source needs attention. A specialist can advise on both the cleaning and the cause.

Does it cost anything to request quotes?

No. SlateTiles.co.za is a free quote service. You fill in one form and we pass it to independent specialists in your area. They quote you directly. We do not do the cleaning or sell any products, and you are never obliged to accept a quote.

Slate Cleaning and Restoration: Get Free Quotes

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