What Is The "acid" Used To Wash Tile Floor?

[watchthewaves 0]

Anyone knows what "acid" or chemical is used to wash the tile floor after it is laid? Thanks.

[taichipanda 3]

Anyone knows what "acid" or chemical is used to wash the tile floor after it is laid? Thanks.

the type that can dissolve fresh from bone if you decide to take a dip in a tub full of it... or else how to soften the hardened cement stains on the tiles.