Most oven cleaners are either caustic based or hydrochloric and that's not good on ally. Turns it black and very difficult to get back. Try to find something containing phosphoric acid as although it darkens the ally it can be scrubbed silver with a stainless steel brush.
Stainless steel pot scourers work OK too, with a bit extra scouring powder.
There is a special scourer for Stainless Steel which removes the discoloring without having to remove too much of the surface, and it brings alloy up well too.