Pardur

The Pardur slate power cleaner with intensive action quickly and effortlessly eliminates lime efflorescence, discoloration and stubborn incrustations of all kinds. Its highly concentrated form is characterized by a high yield. Some types of slate contain a high proportion of lime and are therefore not acid-proof. Test your stone for its acid resistance by applying a small drop of the cleaner in an inconspicuous area and allowing it to soak in for about 15 minutes, then rinse thoroughly with water. If the slate becomes lighter it is sensitive to acid.