With alcohol it’s very clear that there’s one organ doing the heavy lifting
It’s not your liver, it’s your GABA receptors downregulating that gives you a tolerance. Your liver helps with the duration and hangover but the lower peak intoxication is mediated by the receptors. Likewise with cannabis, your THC receptors downregulate to give you a weed tolerance. It is also processed by the liver.
This is nasty to me. Do you not scrub yourself in the shower? Like, if you have dirty hands, and wash them in the sink, you can dry your hands on a white towel and it should not get dirty. Same for your body except you usually have more scrubbing tools to exfoliate your skin and remove the dirt so you should be even cleaner come dry time.
I don’t know that I’d call my used towel “clean” per se, but it’s certainly not dirty. It’s not doing any cleaning or removal of anything, just patting up water.