We have small black spots on our vinyl siding. The chlorine-based "House Wash" sold at Lowes does a great job on the green algae but does not touch the black dots. Power washing doesn't handle it very well unless you focus the blast directly on it for a few seconds. With the numerous black spots scattered all over the house, this is not an effective way to treat the spots. Besides, the pressure washer damages the surface of the vinyl when used in that fashion.
My questions are: (1) does "30 Seconds" damage the vinyl surface? and (2) has anyone used "30 Seconds" on vinyl and was it effective?
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