I'd like to learn to clean my evaporator coils myself. My HVAC units
are hanging from rafters in my attic. Is this as simple as removing a
duct, reaching in and spraying aerosol coil cleaner, then rinsing it
with a garden sprayer? I assume the runoff will exit through the
condensation pipes.

Help?

Pictures of my units:

http://jeffshvac.googlepages.com/

Thanks!