Things You Will Need
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Mix one part bleach to five parts water (in my experience 1/2-gallon bleach to 2.5-gallons of water works well) in the 5-gallon bucket. Put on your rubber gloves, grab a rag and start scrubbing!
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Scrub the vinyl siding with the rag from side to side, making sure to keep the solution from dripping onto your clothes (even this diluted bleach will cause colors to fade).
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After scrubbing a 10 to 12 foot section of siding thoroughly, rinse the siding with copious amounts of water. Repeat this process until you have covered the entire house. Your siding should look as good as new!