Interesting article in the Wall Street Journal about why mosquitos bite some folks and not others - I don't know about you but they're biting me at my house.
How about this . . . . . Currently the most effective repellents on the market often contain a chemical known as DEET, which has been associated in some studies with potential safety concerns, such as cancer and Gulf War syndrome. It also damages materials made of plastic. The federal Environmental Protection Agency has determined that DEET, when used as directed, is safe (well, we've all heard those words before).
If something is so strong it can damage plastic - well, it's tough - those mosquitos don't stand a chance.
