So Soolin and I go swimming. Afterwards, she goes to the bathroom, and I collect it in a poop bag and deposit it in the cargo hatch under the floor of my car, then forget about it. It spends a day baking in the sun on Sunday. Monday morning I open up the car and yyyyyyeeeeech! My car reeks. Dunno yet what I will do to clear that out of my car but was I ever bummed on the way to work Monday morning.
HAHAHAHA! That is funny! I feel bad for you, but still, that is funny. Might I suggest a cloth bag full of cloves and coffee beans and maybe dump some baking powder back where the bag was and leave it for a while and then vacuum it out.

Good luck with it
If it’s not too late you might consider putting it into a small plastic bag for sale on Craigslist.
Alas, the moment for poop bag auctions has passed, the garbage men carted it off some time ago. However, should you like to make an offer, I can arrange for a fresh one to be airshipped to you within 24 hours.