While many people think of mildew simply as a discoloured growth that occurs in damp areas, mildew is actually a growth produced by mould. Mildew needs specific humidity or moisture amounts and temperatures to grow. Getting rid of mildew from your home keeps dangerous moulds from forming and prevents long-term damage to your walls. By removing mildew as soon as you notice it, you will have a greater chance of success in eliminating mould and mildew and preventing their return.
Put on rubber gloves. Combine 1 cup of bleach with 1 gallon of water in a bucket. Dip a scrub sponge in the mixture. Wring the sponge out completely so that it's just damp.
Wipe the sponge over the mildew to loosen the mildew from the wall. Some of the mildew may come off the wall easily with the sponge, but you may also need a soft-bristled scrub brush to remove the remainder of the mildew. Scrub gently to prevent damage to the wall.
Remove heavily mildewed areas of plasterboard. If mildew grows on plasterboard, the mildew and mould often penetrates deep within the plasterboard. When this happens, you will have to remove the plasterboard by cutting it out and replacing it.
Cut out the mildewed areas of the plasterboard with a jigsaw. Use a stud finder to locate the wall studs so you avoid cutting into the wood pieces.
Cut new sections of plasterboard to fit the sections that were removed. Nail or screw the plasterboard in place. Fill any gaps between sections of plasterboard with wall putty.
Spray the walls with an anti-mildew spray. This will help prevent the mould and mildew from returning. This type of spray is available at your local market or home improvement store.