Astonish Mould & Mildew Blaster 750ml Spray Bottle, no. 1 mould & mildew remover. Specially formulated with a powerful bleach action to remove even the toughest mould and black mildew stains whilst killing 99.9% of bacteria. Quick and easy to use. For use on walls, uPVC frames, glass. plastic shower curtains, ceramic tiles, grout, silicone sealant, concrete, sinks and plugholes etc.