Oven cleaner is a great way of de-anodizing something yourself. Just be careful you dont leave it on too long or it'll start eating the aluminium!

Best thing to do is spray it on, leave it on for a little bit (say 10-20 seconds) and start rubbing with a cloth until the anodizing rubs off....then once that is done, rinse the rotors straight away to get the oven cleaner off.

This way, you wont risk leaving high spots with sanding.

Also, the oven cleaner must be a caustic one i.e. toxic, hazardous....caustic free oven cleaners will not strip the anodizing.