Chances are the logos are printed on top of the lacquer so you might be able to scrape them off with some sort of plastic scraper like a bank card.
Acetone will likely work however if you rub too hard, it might remove the layer of lacquer as well, leaving the raw alloy below open to the elements & oxydation
I have a few lh arms at home but there's tons more at work from all the cranksets we changed out for being cracked (only affects the driveside crank arm luckily) and I think some of them may already have the logos a bit worn actually.
Chances are the logos are printed on top of the lacquer so you might be able to scrape them off with some sort of plastic scraper like a bank card.
Acetone will likely work however if you rub too hard, it might remove the layer of lacquer as well, leaving the raw alloy below open to the elements & oxydation