I used to think that simply washing a pumpkin was enough to make it last longer. For maximum preservation you need to go one step further. It’s easiest to use a bathtub. Alternatively, use your kitchen sink!
Fill your vessel with warm water and add 1 TBSP of bleach and a squirt of Dawn dish soap per gallon of water.Set a timer for 30 minutes while the pumpkins sit in their warm bubble bath.