I use Formula 409 (a kitchen cleaner) to keep wasps from building a nest. Just spray them and the nest with it and it not only kills the wasp, it prevents any others from trying to build a nest in the same spot. Works every time. Good luck.
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What can I do to prevent wasps from building a nest in my BBQ grill?
Wasps from Northern, Illinois
RE: Prevent Wasps From Building a Nest
Is this one of those big hearths? Or a little (regular) one? If it is the big permanent grill stove (like made of stone) you could do some landscaping around the back of it (not in front of the hearth) to accommodate wasp repelling plants, or one had a suggestion for hanging a balled-up paper sack to imitate a nest. Keeping away from homes: http://www.thriftyfun.com/tf731619.tip.html Natural Repellants: http://www.thriftyfun.com/tf813198.tip.html
Good luck and let us know how you do. (06/09/2006)
They do this with our wood slat siding, as well. I can only imagine sealing the whole house in spray on rubber. Not joking, they are really bad. And the carpenter bees can be so single minded they will check a 5x10 area over and over and over, trying to find a crack they can fit in. They can't, but the hornets, wasps and mud daubers are everywhere and seem to be getting worse. I put hornet traps out a couple years back, but they're pricey, messy and upset the natural balance of our planet, which is in enough trouble as it is.
So what to do for large areas? Our house is 750sq foot, with a detached garage. Not worried about the garage, it's a stack of cards, but the house is solid and they like it way too much. (07/30/2009)