Red dirt or red clay at the base of houses

If you live anywhere close to the south, you have seen the red stains at the base of houses caused by red clay or dirt. Does anyone have a pretty good method or removing these stains? Some other forums said acids, but I wanted to see what your opinions are on the matter.
Thanks guys,
Dick

We’ve used f9 diluted way down with really good results

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[MENTION=7763]TFFighter[/MENTION]
Do you spray it on there and let it dwell or downstream it?

I typically spray on and brush the bad areas

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[MENTION=7763]TFFighter[/MENTION]
Where do you get your f9?

haven’t had to buy in a while you can Google f9 rust remover and find it

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You can find it on your keyboard right between F8 and F10.

Seriously though, Southside and so does WCR

Jesse
Atlas Services
Exterior Cleaning Specialists
North Carolina