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Depends on coil I would use water if major crud dawn dishwashing soap, don't want to destroy condenser or evaporator coil over some trash cleaner

I have always wired motors as 220v if I can just to have less wear and tear on the windings less volts more amps more heat faster insulation breakdown on a motor

Valves on the outside you mean the suction and discharge of the compressor correct Yes you will need to open those valves for a vaccumm test and a nitrogen test if you don't have nitrogen use and inherit gas like argon, I would pressure test both high and low side to 100#psig Upon blowing the...