Try cleaning with mineral spirits. Though, white aluminum gutters
often hold stains. If you paint, latex is self-priming on the gutters,
just needs a good cleaning first, which you'll have already done if
you try cleaning with mineral spirits :-).
Yes, powerwash them and then paint. About 10 years ago, I did this to mine
and I need to do this again. I can't remember the paint I used. But it stood
up well. I used a "whiz" roller to put the paint and it was quick, simple
and fast using an extension handle on the roller, I did it all from the
ground, no ladders.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.