How about a piece of tygon tubing with a inside diameter the size of the
vent tube. Let that hang (or support it with the wing strut) and let it
drain into a gas can. If you are careful you might even be able to reuse
it. I am lucky, my 172F has never had this condition. A friend with a
150 always had it and only fueled when he got ready to fly.

I use a short piece of hose with some wire mesh in it and a orange
"flag" hanging from it. I put that over the vent tube to keep the pesky
bugs from building a nest in it. Orange flag reminds me to remove before
flight.