Wasps and Clotheslines

So, yesterday I went out to bring in the laundry I had hanging on my clothesline. As I was taking my bright blue shirt off the clothesline, I discovered a wasp thought it was a great place to hang out. I immediately dropped the shirt to the grass, but the wasp just stayed on it, happy as can be. Since I had my baby with me, I collected the rest of my laundry, and went back out a few hours later to retrieve the shirt. The wasp was still on it! I ended up having to grab a stick and push it off the shirt.

Does anyone else have any problems with wasps on their laundry? Any ideas as to how to keep wasps off of them?

Sometimes we have wasps...not very often...do you know what kind yours are? some are more aggressive than others. I usually notice something if I leave things out overnite...or for a day or two in the summer....then it is often one bird poop splat on something. I did put my clothes away once and when I opened the drawer later heard a buzzing and found a bumble bee in a t-shirt
Ants are more of a problem here (that i never solved) it seems like they would cover one section of clothesline in particular and they were hard to remove...always a few coming in on the towels.
I don't know of anything that would keep wasps from landing on things on the line...I suppose they like the heat.

I'm pretty sure they're yellow jackets. I was glad it was a cool evening because it was very docile, but I would still rather not encounter one at all! It wasn't hot that day--It was a little sunny, but the shirt never dried all the way, let alone got hot. Maybe the yellow jacket liked the moisture?