Does anyone have a recommended solution for removing the naturally accumulating crud/oxidation from aluminum tubing that's been outdoors for a while? That is, without resorting to more 'destructive' methods such as steel wool, sandpaper, etc.. It seems I've seen 'aluminum brightner' solution somewhere but I've not been able to locate it. Please reply directly. Thanks & 73 Mike - AD5IU K2 #2602