I wouldnt use a pressure washer but garden hose and lots of cleaning solvent works well. Also the brake clean is hard on paint and plastic....I used to use brake clean when i first started working on saws and after the first stihl that i spent an hour peeling the paint out of the inside of the crankcase that brake clean loosened I havent used it since.
make sure she will run and that you have a air blow gun handy.....now soak in your favorite cleaning solution, mine is purple power just because its easy to get in 5 gallon jugs and they deliver it, let it soak for a few minutes and hose it off. Repeat until clean then blow off the remaining crud and water with the air hose and fire it up. let run for 5-10 minutes to dry everything out...your now ready to disassemble and do a final cleaning on individual pieces that need attention.
If they dont run i will still do that same procedure but i immediately get it torn down so i can dry out everything and make sure no water gets left laying in the crankcase/cylinder.