Bit idea: Person who thinks that wiping with water and toilet paper is not sufficient, insists one is not truly clean until they've wiped the area down with rubbing alcohol
I use a small towel that I hang by the toilet specifically for this purpose. I guess if I had other people using my bidet I would have a big stack of them and throw them into a little hamper after a single use or something, but they only ever touch my butt and I make sure it's squeaky clean before drying so I just change the towel out once a week.
I knew a guy once who would always shower after shitting. If he was in a place that he couldn't shower he would somehow use the sink to wash his ass. It was... clearly compulsive. He also thought it was weird that we thought it was weird that he peed in bottles.
You fools, DMSO is the universal solvent. An added bonus is you can dissolve your drugs in it and clean your asshole while delivering drugs through the skin AT THE SAME TIME.
People mentioning acetone and rubbing alcohol. Those are great! But it can be expensive. A more frugal option is to reuse an old bottle for baby powder and put lye in it, it's basically soap. You can lye in bulk at some places. Just sprinkle it around to keep everything fresh down there.