- Spray the garden statue with a hose to remove debris, dirt and as much mildew as possible. Use a soft brush to scrub the area. Avoid scratching or damaging the statue. Do not use a hard-bristled brush. Rinse the statue off again. In a bucket, mix 1 cup of hydrogen peroxide and 2 cups of water. The hydrogen peroxide naturally bleaches and kills the mildew. Dip the soft scrub brush into the mixture and scrub the garden statue. Use caution and do not apply pressure to delicate areas that may crack off. Pour some of the cleaning mixture into a spray bottle. Spray hard to reach places. Allow the mixture to sit on the mildew for a few minutes before wiping it away with a clean, soft cloth. The ultraviolet rays from the sun will help kill the mildew. Rinse the statue with clean water and allow it to dry. Inspect the statue and repeat the process if necessary. Wipe the statue dry and allow it to continue drying in sunlight.
If this method of garden statue mildew cleaning fails, make a paste out of cleaning powder and water. Paint the paste onto the statue, wrap it in plastic wrap and allow it to sit for 24 hours. Unwrap the statue and use a soft brush to scrub the mildewed areas. Thoroughly rinse the statue. Use a soft towel to soak up as much of the excess water as possible and allow the garden statue to finish drying in the sunlight. - Purchase a concrete water sealant from a hardware store or home improvement center. Choose a day that is warm and dry to apply the concrete water sealant to the garden statuary. Clean the statue with a mild liquid soap, rinse it thoroughly and allow it to dry completely before applying the sealant. Use a soft brush to apply the sealant to the entire garden statue. Make sure to work the sealant into any hard to reach nooks and crannies. Allow the piece to dry completely before exposing it to moisture. Reapply water sealant every two years.
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