Keep your grass cut really short so moisture will dry up faster.Also move your houses and spray that area and allow the sun to dry that spot before u move the house back.And yes remove bedding and burn it and replace with fresh bedding.Just a couple more ideas that may help you.I also had luck with the gneric front line called Pet Armor and frontline doesn't work here at all but Pet Armor worked well and why I guess ingredients must be a little different..But the pet armor and spraying helped me get it under control.