When the tiles are placed, you can clean them with water and neutral or natural liquid soap. Do not use chemicals or bleach. After cleaning, wait until the floor is perfectly dry to avoid leaving stains when the treatment is applied.
The tiles are highly porous and all the humidity must evaporate before the treatment with FILAFOB. The evaporation process can lead to composition of white calcium deposits at the cement in form of white spots that disappear when the slab is washed again with water.