Sometimes it isn't access to a dust bath, sometimes it just rains for days on end and turns everything into a muddy marsh. Just finally stopped raining after days of rain here, and while my girls aren't muddy, they could easily have gotten very muddy!
I have to give one girl a bath every few weeks because she has a chronic case of pooey butt and needs her butt fluff cleaned and trimmed to keep that in check. It is sort of a partial bath. I do it in the kitchen sink (which gets cleaned afterward) and warm water. I use a few drops of dawn dish soap, since it is what they use on oil soaked birds. The sink sprayer/hose is a godsend, too. Your girl may definitely NOT like a bath, so you have to keep a good grip on her with one hand, and with the other wash and rinse. Mine is used to it by now, so she stands nicely with her toes in the water and chatters even as she is getting her booty sprayed with the sprayer.
Afterward, you can either towel dry or blow dry. I towel dry since I don't have a blow drier, I find my girl always falls asleep while cuddled up in the towel.