I have a good size pressure washer 2,600 psi 2.5 gpm, have tried all the soaps at home depot and lowe's and nothing will touch the grime that's on my alumimum siding. Help! The only thing that takes off some of the gunk is a good hard scrub, the pressure washer even at an angle doesn't do much. Do you know of any techniques or cleaning solutions (or types of soulutions) that I should try. Thanks.
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