Once you've got the right space to clean up your pup, here are suggestions from the American Kennel Club for keeping the experience a positive one for all involved:
A major fear for dogs during bath time: slippery surfaces. Place a grippy rubber mat inside the tub, and lay a nonskid rug outside on the floor for when he steps out. Keep your dog's nails clipped to help him keep his footing.
Check the water temperature before you turn the hand sprayer on Fido—it should be no hotter than lukewarm. Use a gentle setting on the sprayer to keep your dog calm while rinsing him.
When bath time is over, prevent him from shaking water all over you by using a microfiber towel to dry his coat quickly.