How to clean the stuck/dry sealant from the rim edge, and the rim tape, etc? (In order to replace my old tubeless tyres with new, and the new ones to sit on a clean/fresh surface). With water? Water/soap? Any other liquid?
I did this weekend it was not hard to do it mechanically with a piece of cloth and water. Then for patching I needed a piece of a very clean surface so I used a dish-washing liquid and then finally isopropanol buth that will probably not be necessary if you do not need patching.
From the rims the mechanical way was enough, a dry piece of cloth or even just fingers were fine, but a wet cloth will be easier.
Tubeless tire sealants and generally latex based, so anything that will remove latex.
Adhesive remover is probably the best bet, e.g. Goo-Gone (sold in the US at least, I don't know if that brand is used elsewhere);