You have just poured your candles and are waiting for them to cure. Now it is time to clean the pitcher and thermometer before the wax starts solidifying.
While the wax is still in a liquid state it is very easy to clean. Use a paper towel or a cloth and wipe off any excess wax. Wash gently with hot water and soap or use rubbing alcohol.
If the wax already has hardened, you may simply reheat the pitcher until it softens or melt and then wipe it off.
Remember not to pour any wax down your drain as this may lead to clogging.