I had never thought to charge extra for it. You squirt the stuff on and the stain instantly disappears. It's the old school rust remover and it works much better and faster than any of the rust remover our distributors sell. Dwell time of 10-30 seconds before rinsing with the wand. One of the easiest stains to remove.
@emeraldclean I have used Chemspec rust remover too, if you try the Whink rust remover you will never go back to Chemspec.
Thanks for the info Todd. I will see if the Cnd Wal-mart stock it.
Chemspec is Hydrofloric acid and works well.
I like to neutralize with ammonia . You get a chemical reaction which is a puff of smoke. I stick my vacuum by spot so it sucks it away.
I was taught to neutralize because plain rinsing isn't suffice as the hydrofloric acid is around a 1 on PH.
Don't see alot of rust my way. A gallon last me forever.
Did have a nice one back in January . Did a job for a restoration company.
Water damage and a fair amount of rust was left.
They said please try to remove if you can or we will have to replace carpet.
Easy peezy.... and charge large