Cleaning powerhead: What works for me.
Remove rewind, clutch cover and top plastic. Baggie over the intake with rubber band. Using a real parts brush, paint brush (for the small places) and mineral spirits get most of the heavy crap removed. Spray it down with foaming engine degreaser from O'Reilleys. Let that soak while I hook up the garden hose in the laundry room. Hot water side. Spray it off with the nozzle set on 'jet'. Stay away from the muffler outlet. Let it dry off in the sun turning frequently to drain the water. Either get it running right away or tear it down in case water got in the cylinder/crankcase.
Makes for a more pleasant rebuild.