hey graeme, i've been doing exactly what you're talking about for the last 7 years, now i do it full time. as far as pressure washers go i use the small 1200 - 1700psi electric models from Wal-Mart, Home depot, or Lowes. simply connect it to the clients hose and electrical outlet and you're good to go. i go anywhere that i can hook up my own hose and run an electrical cord. it's far better to do the job at the person's house than to get involved with driving their car somewhere. too many things can happen with you driving their car - too risky for me. i started out just like a lawn service basically. feel free to email me, i'd be happy to discuss things with you.
