I have yet to see a tank used for rodents for longer periods of time that didn't have its seals damaged. Once they are damaged it will have to be resealed.
Even if the tank is not leaking yet, it will be a major risk in the near future. As for rinsing use dishwasher, clean out well, fill the tank let it sit for a couple of days, rinse, fill it again and let it sit for a couple of days and if it does no longer smell like rodents it'll be fine.