Thanks!

I used caustic soda to remove the ano. Tried a lot of products before that, but none of them really got the job done. So a couple of minutes in caustic soda was all it took. Be careful of not leaving it in too long though. Pick it up often and rinse it with water to make sure you won’t damage the aluminum.

I suggest trying just to hand polish it at first. It’s really easy to scratch the aluminum.