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At any reasonable does, any material that is color-fast in the sun (gel coat, paint, stickers, etc.) will be completely unaffected, and there will be no scratching. Like doing laundry, a little pre-clean, a little time to work, and a rinse. It works even better if you add a little spic-and-span. Do not use laundry soap, as the bleach will crew on that instead of the mold!
My company cleaned the ENTIRE Treasury Department in DC with bleach once. Used a whole truck load. Yes, we neutralized the run-off.
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