I wish I knew this many, many years ago!
water (use fresh water - not from above)
1After you scoop out & carve your pumpkin (aka Jack-O-Lantern), dip it in a large container of bleach & water (see above), 1 minute. The bleach will kill bacteria & help your pumpkin stay fresh longer.
2Once completely dry, (drain upside down), add vinegar & lemon juice to water. Brush this solution onto your pumpkin to keep it looking fresh for weeks.