Wow, I'm sorry at this point I don't even know what to tell you
. I've never had to do anything but apply a topical on the pets and vaccum then they were gone and stayed gone with the frontline being put on each month. It seems this is a problem happening in the south for people. Wish I had some advice but I don't understand why what you've done isn't working either
. I know it's a holiday weekend, but maybe talk to your vet on Tuesday - I'm sure you're not the only one and they had clients with this problem and maybe know if a different product would work better for your area. Good luck