[Amps] How to get the blue markings off of aluminum stock

[Vic K2VCO]

Well, I just finished the cover for my power supply. Removed the clear plastic from the 
aluminum sheet, and it is beautiful -- except for the blue printing that indicates the 
alloy, etc.

How do you get this off? I've tried 91% isopropyl alcohol and various petroleum-based 
solvents without success. I would hate to use anything abrasive because then I would have 
to polish the whole thing to make it look nice again. I hope there is something I can buy 
at the hardware store!

I don't understand why the manufacturer didn't put the printing on the unprotected side.

-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/