Masonry cover aluminum natural blank care

Hello everyone,
On our terrace, we have a masonry cover made of aluminum, natural blank. The cover is very sensitive and has stains (like burned in) that hardly come off.
Do you have experience or tips on how I might still be able to remove the stains or how I can maintain or clean the cover?
Thank you

Nevr-Dull polishing cotton for aluminum, brass, V2a, chrome, etc. We also use it for the bathroom faucet, etc. Just go online and enter NEVR-DULL ;)

Thank you for your tip, I will test it!