The rust stains won't come out though and the homeowners are mad. They are demanding that the landscaper repair or replace the drives that have been damaged. He's tried to remove the stains w/ no success and is now faced w/ having to replace the drives, which would be very expensive ( insurance isn't an option ), or end up in court. This has the potential to seriously damage or destroy his business.
I'm wondering if there is someone who has tried removing this type of stain before and has some advice for doing so. It seems to me that there must be some compound out there that will do this job.