cleaning aircon pump, ault etc anything alloy. links inside
 

would like to clean up my aircon pump etc, but want to know what is best to use?
i dont really want to take them off.
there seams to me some oxide on them.

what do you think to this stuff?

Alu-Magic (250ml) (V130) - CarCare - Frost Auto Restoration Techniques

Frost Ali-Clean (1 Litre) (V135) - Cleaning - Frost Auto Restoration Techniques=

or is there anything else you would recomend?