On Sep 23, 4:14*am, "scorpionleather" wrote:
Once I figure out how to get the sheet metal covers off the indoor
evaporator coil, what kind of cleaning liquid or spray is the strongest and
still safe to use on the coils? *I'm thinking of something I can get at the
local hardware store, not something I'd have to go to an AC specialty shop
to find... *this evaporator has not been cleaned for 20 years, mainly
because the panels are so hard to remove. *Still seems to work good though,
but I'm sure it will be more efficient once I get the dust out.

If you have black areas on the coil it may not be dirt but mold and I
do not think a mild acid will kill mold, a pro product is likely a
detergent, mild acid or alkaline and something to kill mold all in one
product. Your AC coil actualy cleans itself from condensation running
down the coil so if its dirt you have a air filter problem. A working
air filter will keep a coil clean. Any acid will affect a coils
integrity you need to rinse well, but a pro product will be safer and
do the job right. Maybe its dust and just water or mild soap will
work.