In reply to olddirtydoggy:
Washing machine, no spin, no aggressive detergent, dry laid flat away from sun and flip/flake the rope now and then while it's drying.
For first couple of climbs you will be thinking "damn I might have been better off with a new rope", but some time after you will forget about it. I cleaned my rigging/indoor/cragging (when you can't be arsed with two 60m 8.1mm halves at a 10m crag) single rope and it still lived for some time before being retired due to more serious sheath damage. Maybe it was just bad luck, but the rope got dirty again really quick.