The clear coat is very tough - you need use a strong automotive/aircraft type of stripper.....the stuff you get at Home Depot and similar stores for furniture will not work:
https://shop.advanceautoparts.com/p/aircraft-ultra-paint-remover-powerful-for...

You can use plastic scrapers and coarse steel wool to remove the clear coat once the stripper has done the work.  After using the stripper wash the parts with soap and water to remove the stripper.....it is safe for aluminum but needs to be washed off.

Then you can sand out the corrosion starting with 320 or 360 grit wet/dry sandpaper...the paper lasts longer if you keep things wet.  Then use 400 and 600 paper to get the scratches from the heavier sandpaper out....keep going with finer grits until you wear yourself out and the surface is smooth.

Polishing can be done by hand or with a buffing wheel and power equipment.

Once the metal is shiny you need to keep it polished to prevent corrosion - or apply a clear coat (Most coatings from spray cans are not fuel resistant.....unless they are 2K and have to be activated prior to spraying).

It takes time - but the results can be worthwhile.