Definitely you can use larger, I know people who use 4 and even 5 foot tubs for their ball pythons. Just as long as it's a plastic tub, it maintains heat and humidity well.
Actually while I clean, I just put them in an empty 15qt or any tub I have available. They can chill in there for even up to a couple hours if needed, for whenever you finish cleaning. No need for a whole other setup.