I used a cooler with a former life, soaked it in PBW for a few days (more i couldn't get back to it for a few days, than needed that long) rinsed soaked in bleach for a few more days. Rinsed it good and its been making beer ever sense.
Don't take any more faith in anything I say than you would anyone else on the internet. If you listen to what I say, then hurt your self or break something it is your own fault, I am just expressing my opinion or experience.
THINK for your self!!