I'll admit that I have no experience with a mini flesher. I was considering getting one until I read other taxidermists on Taxi net saying they were junk.
If you do a search over there you will see post after post stating they are junk and not wrth the money. Most say to put your money toward a table top flesher. They are always in the classified section for sale.
As for the pressure washer.......They do work well for fleshing.
Ever tried one?
There is a difference between fleshing and thinning a cape. A pressure washer will not thin a cape. It will however, take the meat off of a cape very well. I also learned about this over at taxi net.
I have used a pressure washer, although mine is slightly underpowered, and it really gets the meat and shreds up the membrane, leaving a clean white underside to the cape.
You must use the turbo nozzle and not the flat nozzle.
Give it a try and you'll be impressed.