Grout Cleaner 500ml Easy Cleaning of Black Mould from Bath Kitchen Shower Tiles. It easily removes mould & black spots from grout & silicone with fast & effective cleaning power to grout joints.NEW! Essential Grout Mould Cleaner is a fast, effective & safe spray cleaner specially formulated for the removal of mould, algae, fungus and unsightly black spots commonly found on grout joints, silicone sealant, and hard surfaces, i.e. bathroom area, wall tiles, ceramics, porcelain and most types of natural stone tiles.