I found a mixture of white vinegar, baking soda, hydrogen peroxide and a couple drops of dish soap, put into a spray bottle works wonders killing urine odor. You can find the measurements and instructions on the internet or on Pintrest, under urine odor. It saved our mattress. Good luck, 🙂

Here is a video from Teepa Snow.
https://youtu.be/7OLrilAeT1U
She has many videos on a variety of dementia topics but this one might give you some help with showering and bathing.

I am finding it difficult to get my husband to shower regularly. He was always a stickler for cleanliness. I did get a walk in bath which makes it easier as he has a place to sit. I now just say “It’s bath time, come on!” He isometimes mumbles and frowns at me, but I just keep urging him to the bath. Once he is bathed I flatter him with how handsome he is. Etc.

Same problem. H always was aware of when to shower. Being he worked outside he showered every night. Now, when I mention shower he says he just took one. I keep tract on a calendar but he says I’m lying. Big problem. Then when he does shower he’s in there 30 min. I’ve heard they become afraid of the water. I have to yell in there to remind him to shampoo his hair. Talk about frustrating...

This is my husband. He gets up and puts on yesterday's clothes. I am now changing them out after he goes to bed. Things sometimes get overwhelming