Slate is a highly absorbent tile (some much more than others) so when it is used outside it’s really important to make sure a high-quality slate sealer is applied in order to protect it from weathering, stains and damage.The Slate Cleaning and Sealing Combo for outdoor surfaces includes a stain-removing detergent to clean off stains (even very badly stained slate will respond) as well as a natural-look slate sealer that will provide excellent protection against stains and water marks.The Slate Cleaning and Sealing Combo for 10 square metres outside includes:⇒ 1 litre of FilaPS87 degreasing stain-removing detergent for cleaning slate tiles⇒ 1 litre of FilaW68 natural-look slate sealer (enough for 2 coats for 10 square metres)Normally $517.41, save 15% by buying the combo for $517.41View the product sheets by clicking these links: FilaPS87, FilaW68Cleaning Slate Tiles with FilaPS87Dilute FilaPS87 with water at a 1:5 ratio.Spread onto the surface and leave to act for a few minutes. Scrub with a scrubbing brush or a single-disc cleaner.Vacuum or wipe up dirt and then rinse with plenty of water.Sealing Slate Tiles using FilaW68 Slate SealerMake sure the surface is clean and dry.Use a paintbrush or lambswool applicator to apply a coat of FilaW68.Apply a second coat immediately at right angles to the first.How to Clean Slate on an ongoing basisUse a 1:200 dilution of FilaCleaner for regular cleaning, or a dilution of 1:30 when a more intensive clean is necessary.For spot stain removal, use Fila NoSpot for oily, greasy stains or FilaSR95 for organic (food-based) stains.These products are available to purchase at a discounted price in the Tile Cleaning and Stain Removal Combo.