ChiPoo dogs generally only need bathing every 2-3 months--unless of course the dog gets especially dirty or stinky and an "emergency bath" is in order.
It's important when giving your ChiPoo a bath that you use canine shampoo (and conditioner, if desired). The kind made for humans has a different pH, and will easily irritate the dogs' skin. The best shampoo for ChiPoo dogs includes brands like Earthbath, Buddy Wash, and Pro Pet works--all of which will make your ChiPoo smell fresh and clean.
How to bathe a ChiPoo: first give the dog a good brushing. Your ChiPoo might be small enough to bathe in the kitchen sink; otherwise, a bathtub (which hopefully has a spray nozzle attachment) or an outdoor plastic pool using a garden hose will be fine. Wet the coat thoroughly, then apply a small amount of ChiPoo shampoo to the dog's back. Lather well, working downward and outward as you go. (And don't forget the legs, underbelly, and tail!) Clean the dog's face, head, and ears with a washcloth, then rinse the coat completely. If using canine conditioner, repeat the entire process with that.
Towel-dry the coat when the bath is done. ChiPoo dogs with curly Poodle-like coats will be better off if the coats air-dry--but otherwise, you can continue drying with a hair dryer on its lowest heat setting, brushing the hair out as you dry.
Finish with another quick brush-through to make the coat look neat and clean.