If there is heaps of dried up mud you can put it on the rev limiter in neutral and a lot of it will fall off.
CT18 for me, sometimes gerni sometimes not, depends if I can be bothered setting it up, there is plenty of pressure in the hose at my place anyway.
Mine is a Winner 11 by Karcher, it was cheap I stole it off my old man, think he only paid about $100, it works well.