Our pup hates running water, it freaks him out. A hose, the tap, whatever... so this is what we do:
we fill the tub about 1/3 of the way, I get into short and a t-shirt and get in the tub. My husband gets the pup (about 60lbs now), puts him in with me. He gets a treat. We tell him to Sit, he gets a treat. We rinse, later, he gets a treat, we rinse... We use a bowl to scoop water and rinse over him from the water in the tub. If the water gets too soapy/dirty we drain a bit, I hold onto the pup and we put more water in the tub to fill it back up to rinse off better. He gets a treat.
When he is all clean, we drain, he shakes, he gets out, we try and towel him off as good as we can, he shakes, we towel some more, he shakes... then we let him out of the bathroom to completely dry off.
I can do it by myself, but it is easier and more efficient if there are 4 hands instead of 2.