Rust converter/very good
Yes, actually I do have a before photo so Ill take an after photo and post them here.There are several type on the market and easy to find. Just search "rust converter". Most are non toxic at all and water based.
I tell you they can recondition old factory manifolds and exhaust pipes.All you do is paint it on generously with a brush. It will go on milky white and looks messy at first. DONT worry about that, just brush it in good and in about a half hour or so it will desolve the rust and turn it a pleasant dark color.Gone is the dull red rust. Using this product is addicting.You end up searching the entire car for rust to kill.It is great for leaf springs ,rears frames,suspension parts, cross members, exhaust systems, you name it .One quart goes a very long way.
Buy the brush on type not the spray on ok? Here is what I used this time .
http://www.plastikote.com/plastikote/indust/template.jsp?searchcode=AMP&product=RustConverter