I just have MS, but tricks for drying yourself off after a shower.

I have an electric tower fan. I turn that on, and stand in front of it. I also have a hair dryer. (don't use the Hot settings when drying off personal areas!! Personal area skin is sensitive, and might burn easily. Use the Cool settings! don't ask how I know)

I am also not afraid to use more than my fair share of towels. I average two towels to dry everything off, and I try to dry myself off before leaving the shower with a couple of hand towels, or wash cloths. The hand towels are also something that I throw on the floor of the shower so I can try to either dry the shower floor, or stand on the towels to get up and out of the shower without slipping and exiting the shower the hard way.

As for the other question for cleaning yourself off after using the potty. I had that same question a few years ago. I just have problems with numbness in my hands. I can still use them. They're just numb and tingly. When they're extra numb and tingly, and it's hard to tell what and where you're touching things and places. I have a box of vinyl gloves. I love those vinyl gloves. Makes me not worry as much for what I could be touching.

edit

this is the fan that I stand in front of to dry off. I got it because it's a narrow profile and doesn't take up much space, and it oscillates.