Yeah, oven cleaner can... ...cause pitting to the aluminum.
There's a thread somewhere about a guy using oven cleaner and decided
the mess it made was worse than what he'd started with. Especially when
you realize the anodizing is something you really want to keep. ;)
Alvin in AZ
ps- Oven cleaner is basic and aluminum reacts with strong bases. BTDT!*:)
Aluminum is anodized in an acidic bath. :)
pps- Hadn't tried it but, I'd bet on acid vs polyurethane before I'd put a
strong basic solution like oven cleaner on polyurethane coated aluminum.
Acid is known to work to remove/loosen polyurethane.
*ppps- A magnesium VW engine case in a lye bath that had an aluminum
plug in it... gases poured out of the bath foaming that sucker up something
awful. LOL :) Took the engine case out and it was sizzling hot around that
aluminum plug. Rinsed it off, removed the plug I'd forgot, put it back in
the lye-vat. -shrug-