This is a painful lesson to learn for sure.
Here is what works for me, everyone will have a variation that works for them!
1. Avoid wiping. Get a squirt bottle (sometimes called a 'bidet' bottle) and fill it with warm water before you go. Rinse, rinse again, and again and then blot gently with TP. Yes, this means carrying a bottle into a public bathroom. It is worth the effort as it is better than wipes.
2. DRY is key. So after I clean, whether with a squirt bottle or bathing, I wedge some dry TP back there to absorb every bit of water possible. You could use a cool blow dryer if that is workable. If you do use a wet wipe, you need to dry after.
3. Apply zinc oxide cream when you are clean and dry. If you are wet this will just seal in the water and make matters worse. Do this every single time. You can get away with skipping once in a while, but do it too often and you will regret it.
4. When you are in a bad way (I've been brought to tears) the best thing is to bathe. You can get in the shower , a shallow bath, or a sitz bath. A sitz bath is a basin you fill with warm water and then stick in your backside. After soaking, dry well and then apply the barrier cream. Did you notice I keep mentioning 'dry'? That's for a reason.
5. My doc prescribe a med for me. Cholestyramine is a bile acid binder, it will make your output less "hot". I mix it up in water and drink it twice a day. Very nasty, but it does help. She also gave me hydrocortisone cream, but you can't use this long term - better to stick with the zinc oxide.
I get that all this is very time consuming, but you will get faster at self care and it won't seem as hard. Plus your skin will actually toughen up after a while.