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To prevent condensation building up on windows ensure there is sufficient ventilation in the room. If you have a build up of mildew stains, rub a dry, mildly abrasive sponge over the mildewed area, this will loosen some of the black mildew. Wipe off with a paper towel and discard. Wash down with warm soapy water and a sponge.
Put on rubber gloves and in a bucket mix 240mls of household bleach with 4litres of water. Dip a soft sponge in this solution. Squeeze excess fluid out of the sponge before wiping down the wood surface. Wipe down the mildew-stained wood and then scrub heavily stained areas. Rinse out the sponge frequently or use a new sponge. Allow the solution to sit on the stain for a few minutes to kill the mildew. Wipe the area well with paper towels to dry the wood as much as possible. If you have a fan heater direct towards the window to aid drying.
For more cleaning advice from the experts or to find your nearest Merry Maids find your local or call 0800 021 3072.