Procedure to strip anodized layer off aluminum.

[clab]

Try Lye

A little household lye dissolved in water has always worked fine for me, but you have to watch it, as once it breaks through the anodize, it will pit the aluminum rather quickly.

[remarc1]

The anodized layer has degraded over 40 years of service. I need to strip it off. The aluminum is a sheet of 4' by 14'. I've done ordered the chrome and anodize stripper but it may be designed for a tank. What options do I have?

thanks