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Old 08-23-2019, 01:26 PM
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zooeyhll zooeyhll is offline
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Default Cleaning the roof of a farm machine shed

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I have a 40 x 72 steel machine shed on my farm. The roof has accumulated a coating of dirt/dust, that the rain doesn't seem to wash off. Turning the white sheet steel into a sort of off-white color.

I would like to know if pressure washing will remove this grime. It doesn't wash off with ordinary rain. I've got a smaller building (a two car garage) with the same kind of roof. I got the grime off, but had to scrub with a long car wash brush to do it. But obviously that wouldn't be convenient for a much larger roof on this machine shed.

Thanks for any advice!
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Old 08-23-2019, 02:01 PM
MattB4 MattB4 is offline
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It might but it sure would be dangerous up on the wet steel roof trying to do it.

I have a problem with buildup of cedar needles on my buildings that in the past I climbed up and broomed off each year. But this year I noticed that I am getting too dang old to be walking around on a sloped roof especially a metal one. Too bad because as the needles rot and turn to soil they can deteriorate the surface.
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Old 08-23-2019, 02:32 PM
Mr4btTahoe Mr4btTahoe is offline
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Pressure washer should do the trick. Id start by using some siding wash designed to kill mold.. spray it down good.. let it sit for 10-15 minutes... then pressure wash it off. This will help prevent the mold and such from returning.

If you have a way of doing the work from a piece of equipment instead of on the metal roof itself, you'd be better off safety wise. Metal roof and water is no fun to work on.
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Old 08-28-2019, 10:07 AM
Brettny Brettny is online now
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Let it dry and use a leaf blower first. Then pressure wash clean. White vinegar can kill mildew and algee with out harming alot of other things.
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