What kind of surface? Whatever it is, I would avoid getting it on any
metal. When our condo was painted, the contractor used something that
smelled like bleach to spray all over the painted concrete block/stucco
ext. walls, and pressure washed afterward. I thought the sequence odd,
but they did a good job and it still looks good after 6 years. I don't
know what bleach does when it dries, but I would rinse it with clean
water and let the surface dry very well.
Common bleach is a solution of sodium hyperchlorite. It breaks down
into sodium chloride (salt) and oxygen. Oxygen is what does the
bleaching. You are dealing with dilute salt water. Power washing it
off seems to make sense.
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