This customer, who lives in Wollaston, a small village in Northamptonshire, called me to look at the unfortunate condition of her Riven Slate tiled patio. She had hired a builder to install it, but he had neglected to remove the grout haze which had occurred quickly enough, allowing it to set. He was subsequently unable to remove the haze because he had already sealed over it. This had left it looking very unsightly, as you can see in the photo below.
It was agreed that I would immediately carry out the removal of the old sealer and the grout haze beneath, but leave the re-sealing until the Spring of the following year when the weather was dry. The customer understood that when I returned in the Spring, the patio would require another light clean and brush to prepare it for sealing.
To put the customer’s mind at rest somewhat, I carried out a test clean on one slab of the patio using Tile Doctor impregnating, colour intensifying sealer, known as Colour Grow. This darkened the tile and provided a natural look finish, which was preferred by the customer. I also returned to the property several days later to carry out a water repellency test, but as you can see from the photo below, the rain beat me to it. Thankfully, the repellency test had positive results.
Cleaning and Sealing a Riven Slate Tiled Patio
To begin, I removed the old sealer using a strong mix of Tile Doctor Remove & Go, which is a stripper and cleaner. This product was scrubbed into the tiles with a rotary brush machine. Net, I rinsed away the resulting slurry and soaked up the water with a wet vax machine.
This initial clean exposed the true extent of the grout haze – it was over all every tile! My next course of action was therefore to remove this using Tile Doctor Acid Gel, which is a gel cleaner specially formulated to neutralise grout haze. This was allowed to dwell for a short period before I brushed it in.