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I remove rust a lot of the times through the electrolysis rust removal method. I have had great luck with it. I restored a lot of old woodworking tools to fix cabinets and such. Its the least damaging way I have found. It doesn't remove any metal , it just causes the oxidation to release. If I have something with bolts rusted it will cause them to break free. But don't use it on chrome as it will cause it to loosen and come off.
On aluminum I use oven cleaner. I check it every few minutes with a fine steel wool piece to see if the tarnish is off. After it is easily removed with the steel wool I wash it off and go all over the aluminum with scotchbrite. I then polish it with a product called siver wadding compound. Its a silver cleaner in walmart. I have gotten almost a mirror like finish on aluminum doing this.
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