During my last siding job I used a aluminum ladder. It only took about half an hour before my sweaty hands were black leaving fingerprints and smears all over the siding. I have seen this problem for years, it's obviously a reaction between the moisture and the aluminum. Soap and water works but who has time to wash their hands every half hour providing there's running water available at the job. Does anyone have any tricks, products or solutions in general to the problem?