Removing Rust From Slate

[optimalpw]

Anyone have an idea how to remove rust from slate roofing looks like run off from a rain gutter spout.

[OrlandoRoofCleaners.com]

Oxallic acid in a pump-up sprayer.

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[optimalpw]

Thanks for the information where's a good place to get that type of acid. Also thanks for the heads up on the signature.