Mantis Trouble

Yesterday, I discovered I have a huge problem. When Dave and I got home from church, we noticed a praying mantis had stationed its self on the front yard hummingbird feeder. Dave shooed it away so we could change out the sugar water, but this morning it had returned. Not only that, but another mantis had claimed the side yard feeder. A long time ago, I had watched a discovery channel show about the praying mantis, and learned that they have been known to occasionally feed on hummingbirds. I googled this to see if I was remembering correctly, and found out that not only is it true, but it happens quite often. I rushed outside, grabbed the hose, and gave each feeder a good spray, only to find the mantises (is that the correct plural?) had returned. So I've spent today, going back and forth, indoors and out, to spay the hummer feeders. If the manti (is that the correct plural?) return when Dave is home, I'm going to have to ask him to dispose of them. I know that's harsh, but I can't spend my days worried that I've lured hummingbirds to thier deaths. I have no great love for mantises (?) anyway, but I've learned to tolerate them because they're good for the garden. However, I have no tolerance for the ones that lie in wait to ambush defenceless hummingbirds, because they're too lazy to forage for insects. I'll take my feeders down if I have to.