[pjr710]

My car was sitting this winter outside under a cover, i didn’t intend it to so i never really winterized it like i would have. I opened my hood today to charge my battery and my oil cooler had what looked like corrosion on it like your battery terminals get, some of my alternator did too.

I was pretty surprised. Does anyone know why this would happen? I did get my car detailed right before it sat and i know the detailer did some of the engine bay. Could it be from something he used?

Either way is there a best way to get it off? Otherwise I’ll just scrub it.

[Welcome to NBA Jam]

Does it look sort of like white spots? I'm not sure exactly what causes it, but you can get it off really well with a wire wheel. It'll get nice and shiny.

I did discover that if you spray engine detailer on it while it's warm, it'll corrode again (or stain or something, I dunno what it is) - so don't do that

[pjr710]

Yea it’s white. I rubbed it and it turns into like a white powder. It looks like the titanic underwater lol.

Alright I’ll scrub away

[mecheng77]

Wd40 and some elbow grease

[nsjames]

that's aluminum oxide.

a mild acid removes it.

spray it with vinegar, brush it off, wash thoroughly.

[pjr710]

thanks for all the replies guys!