Rust/EX is sodium mercaptoacetate, aka sodium thioglycolate. It is an organic reducing agent designed for originally for reducing waviness or curliness pf hair. Unfortunately, when used in more than .5% solution, it's also a fantastic depilatory.
Its used now for the purpose of removing tannin and iron oxide stains, particularly from porous rock and concrete. It doesn't do much for anything else, though.

Well Dr. Frank, thank-you for the education...

For me those chemicals keep my sinus passages clear....:rolleyes:

Sniff, sniff !!

You must have REALLY hairy sinuses :eek:

Fsr
 

Try a product called FSR..I have used many time and it cleans all stubborn stains..wipe the gel on with a rag let it sit for a couple minutes and wipe and hose off..should get the result your looking for!