Removing Urine from Bluestone Paving Tiles
Urine is acidic and can have an etching effect on some masonry surfaces like bluestone, limestone and sandstone.
It can penetrate deep into porous tiles leaving ugly stains on the surface.
In a lot of cases the stains are not noticeable until a sealer is applied on the surface which can then highlight and expose the stains.
Animals like Possums can do a lot of damage when they get up into your roof cavity, but they can also leave a mess at ground level!
The example shown here is possum urine stains on newly laid porous bluestone pavers. Unfortunately, the tiles were not pre-sealed prior to laying so the cleaning prior to re-sealing was quite a challenge.
The Stain Eaters used an alkaline chemical solution to neutralise the acidity bringing the pavers back to a neutral pH rating.
A follow up chemical solution then extracted the urine from deep within the tile to the surface where pressure cleaning removed it and thoroughly cleaned the tile.