What can I wash my metal siding with that won't be harmful to pets or
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Paula
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Dawn original dish soap and water.
Mean green or simple green .
http://simplegreen.com/products/pressure-washer-house-siding-cleaner/
Use Joy dishwashing soap and a little bleach. Just rinse really well. Joy is the only soap I know of that doesn't streak.
Dish soap and water for sure!