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Old 02-03-2013, 10:35 PM   #1
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Default Rust on building

Have rust underneath ac units on stone building.
Any recommended chemicals for this?
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Old 02-03-2013, 10:54 PM   #2
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I used CLR it worked but i'm sure there are better products.
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Old 02-03-2013, 10:56 PM   #3
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aluminum brightner
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Old 02-04-2013, 05:15 PM   #4
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you want oxalic acid for mineral rust.

for corrosion rust...light muriatic acid in several applications...did I say light?
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