I'm no help as far as the sponge goes. But for the bath, try it when he's hot. Turn your water on to about half the pressure, stand back and start with the hind legs. Start at the hoof and work your way up the leg. Move to the front leg and repeat. Move the hose up to his butt so it let's water run down his sides, then slide the hose forward slowly.
You can get him to like bath time, but it might take a while. If he likes to be rubbed on, wet him down and shampoo him, making sure you give a thorough massage while you're at it.
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