*CBHVAC* writes:

I have a cleaner that is used on coils, that isnt sold to unlicenced
persons, and will eat right into a coil after about 5 minutes if its
used wrong..used right, it looks like the coils about to catch
fire...its steam of course,

No doubt. I'm sure the customer stands in slack-jawed wonder at this
professional procedure. Do you carry photos of dust mites to sell duct
cleaning, too?

but sir, you are dead wrong.

Read the OP, about some consumer stuff sold at Home Depot. Not the
Licensed Person brand cleaner.

But I am not aware of any cleaning chemicals that require any license,
much less an HVAC (restraint-of-)trade license, so please cite one by
its IUPAC name or CAS number. And be sure to tell us what governmental
authority is enforcing non-sales of this chemical to us unlicensed
folk, like the DoJ and lysergic acid.

I suspect you confuse marketing with chemistry, like the "professional"
shampoos that are only sold to "licensed cosmetologists".

I repeat, butyl cleaner and agitation are all you ordinarily need to
clean an evaporator coil.