The Astonish Specialist Mould Stain Remover Extra Strength is a powerful solution for removing mould and mildew stains. It works quickly, requiring no scrubbing, and can be used on a variety of surfaces including walls, uPVC window frames, glass, plastic shower curtains, bathroom tiles, grout, silicone sealant, concrete, sinks and plug-holes. Simply spray the product, leave it to work for a few minutes, and then wipe clean.