Sounds familiar.I've invested in some bumper packs of baby wipes and OH seems more amenable to those than a wash with a flannel or sponge. I have now been allowed to do some parts of him with the wipes, and to be honest, he seems to be enjoying the attention as he gets more used to it. I asked him if he would use the shower if he had steps and/or a seat, grab rails etc, and he said he regularly showers and he doesn't know what I'm talking about!
Apart from my husband has zero language skills left - poor man. He's so scared.
I literally end up showing him I am using the body wipes etc myself which is quite handy after a few not nights.
Helps a little bit.