Heather... Heather... I will tell you the best way to sterilize.
Get all your pots into one area, wear goggles and fireproof gloves, then blowtorch the heck out of them until they are a big heap of melted plastic. Now the real challenge is to re-heat and mold back into shape. The good news is you can now custom shape any size you want!
This is also the most effective way to rid of bugs, bacteria and disease (with the exception of mad cow).