Re: having trouble cleaning aluminum
 

I work for a company that does aluminum fabrication only and if our parts are too dirty/ stained when they come back from CNC waterjet cutting then i use an etching solution made by Eagle 1, originally intended for mag wheels, works great.
http://ec1.images-amazon.com/images/...LL._AA160_.jpg

Re: having trouble cleaning aluminum
 

Sounds like machine setup or just basic technique that may be at fault.