I've started power washing homes recently, and I find that aluminum doesn't come as clean as I would like to see it. I was wondering what chemicals and/or methods could be used to get a deeper clean from aluminum.
What type of aluminum are you referring to? Siding? If so, be careful cleaning it...if it is older and oxidized, you can take the paint right off....it can be difficult to get a decent clean on older aluminum. I use bleach and Citracleen and it has worked well for the small amount of aluminum I've had to clean. Just be careful with the pressure.