For all acid-sensitive natural and artificial stones: Marble, granite, slate, clinker, Jura marble, sandstone, quartzite, tiles, ceramics, porcelain stoneware and concrete stone, for the Indoor & outdoor areas The surface first Remove coarse dirt with clean water and let dry well. RUST STAIN REMOVER afterwards Spray undiluteduntil the stains are completely wetted. 5-15 minutes exposure time, thereafter Rework with scrubber or brush and finally Rinse with plenty of clean water. Do not mix with other chemicals, keep away from oxidizing agents. In the case of very light or white stones, the violet discoloration only disappears completely after a few days due to UV radiation. This process can be accelerated by reworking with an alkaline cleaner such as CleanPrince TILE AND STONE BASIC CLEANER.
eBay