Yeah, that was about my reaction! I've talked to a few contacts in the wildlife industry, and from what I've been hearing the most, is the mothball solution is actually an old wives tale. Most of the guys I've talked to say while the mothballs can help, the toxicity can react with any guano causing a more dangerous version of the mold that grows on the guano naturally. I'd go for a cat, but my eldest and my granddaughter both are allergic to cats. Either way, we're going to try the bat houses first, then go to the pro's if it comes down to it. I'll keep ya posted in the future as to what happens!