Our most powerful, highly active, ceramic stain remover and restorer. Heavy duty for ceramic tiles, quarry tiles and concrete factory floors. Highly biodegradable, phosphate-free, hi-tech formula: pH 13.5. Surfaces which can be cleaned & cegreased with Punch include glazed and unglazed ceramic tiles, sawn sandstone, terracotta tiles, Mexican "Chicklet" tiles, semi-glazed quarry tiles, steel trowelled and wood-floated concrete, tile grouting, brick and clay pavers.