I have, plenty of times, it’s much quicker and easier than slaving away with the wfp.
I only use the PW where there Isn’t slotted soffits though, and I usually spray them with a degreaser or bleach first so it loosens the algae meaning low pressure cleans them up.
It’s much quicker and easier, but not always a good idea, depends on the type of gutters and facias...