4 bottles for the price of 3 unlike other sprays on the market mrs coopers mould mildew spray both destroys mould and mildew on contact and then prevents it from reoccurring ideal for bathrooms kitchens secondary double glazing units in fact anywhere where damp is a problem great on grouting silicone sealants and shower curtains damp plastered walls and ceilings in the home can also be treated and it is effective on algae fungus and moss so garden pots tubs and ornaments can be cleaned and