If you want to destroy the colony of ants altogether, it is simply enough done. Get a tin of boric acid from the local pharmacy (you'll probably have to ask for it, and the pharmacist won't know what you mean, and you'll ask someone else and they'll show you the 20 Mule Team Borax and you'll say, "No, it's in a pharmacy tin like pills come in, but it's a loose powder," and they'll shrug and hand you off to someone else who will finally know what you are talking about and hand you a pill jar with "boric acid" written on it and a skull and crossbones to show you that it's dangerous, but only if you eat it--so don't). Heat some water on the stove. Make up a mix of 1 part hot water, 1 part sugar, 1 part boric acid, and probably a few drops of food color so you can see where it is if it spills. Once it cools, feed it to the ants. They will eat some and take the rest back to their nest to feed the babies and the queen. It kills slowly so that they have time to spread it around and it kills the entire colony instead of just the ants you can see.
To feed it, you can either just spread it in their path (preferably on a piece of cardboard or something so it doesn't get your surfaces dirty), or you can make little containers with tiny openings for the ants to go in through (this method prevents pets from eating it). You DO want to be careful not to let pets or children eat it, as it will taste sweet to them and it will make them very very ill.
You will need to leave it in their path for at least three days. This is the hard part--don't kill the ants as they go in and out of the container (or as they are feeding on & collecting the bait). You want them to live long enough to take it back to their queen and larvae. It will be very hard to watch them feeding and enjoying themselves--and they will do so, in droves--and not do anything about it. But your patience will pay off.
Anyway, I do sympathize with your problem. We get ants in our house on occasion, large scout ants looking for yummies. I once left half a watermelon out on the counter by accident overnight, and when I got up in the middle of the night, it was completely black from the ants that were feeding. They were the big carpenter-type ants, and they scurried in a million directions when I turned on the lights. It gave me the heebie-jeebies. And of course, I couldn't get rid of them after that, short of killing them all, because they knew where the good stuff was. So I had to destroy their entire colony (per the instructions I just gave you). It actually makes me sad to do that, because ants are a valuable part of our ecosystem, and I hate thinking of the slow and painful death they suffer, but I also cannot cohabitate with an entire colony of large scavenging creepy crawlies. So they had to go.
Hope that helps. Glad your incubator is clean for now. Do keep it carefully guarded, as the ants back at home know where it is now, and they will continue to try to get to it.
Good luck with your hatch!
Heather