Acidic cleaners are purposeful and must not be applied to natural stone surfaces without due diligence. Acid on most occasions will cause damage on marble, limestone and travertine surfaces as they are calcium containing. Discolouration over granite, bassalt and quartz is common with stronger acids. Therefore it is always advised not to use an acidic cleaner unless it is absolutely required. Knowledge of the stone type as well as it's finish is of utmost importance. Our knowledgebale sales team here at Stone Doctor Australia is always happy to advise you on the correct product and procedure required to successfully clean your stone and tile surfaces. The 3 products here have different uses. Lithofin MN Builders-Clean is strictly used to remove excess grout and cement haze over sawn finished external granite and bassalt pavers. Lithofin KF Active-Clean is to maintain the cleanliness of ceramic walls tiles and Lithofin KF Cement Residue Remover is designed for initial cleaning of newly installed vitrified porcelain wall and floor tiles.