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Sometimes, we can run into rust on shingle roofs. I always used an acid wash to remove it that I made up myself.

These pictures are from Craig Harrison of F9 BARC, who make an excellent already mixed acid based cleaner for exactly this purpose

 

rcia 4.jpg

rcia 3.jpg

 

 

Edited by Apple Roof Cleaning (813) 655-8777

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So I know mixing Acid and SH will potentially kill you. Sometimes we come across roofs that have both algae and rust. Which to use first? And do you rinse after using the one? 

Remove the algae first with the SH Solution, and it is always best to rinse first, before you hit the rust with an acid

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