A better product to apply to the door frame would be invade hot spot foam. It is a foam in an aerosol can. It would not be as messy as the drain gel. The real benefit though would be that the foam will coat the areas in question much better and expand into cracks and crevices of the door where the larvae may be breeding.
Invade Hot Spot Foam: http://www.domyownpestcontrol.com/invade-hot-spot-16-oz-can-p-856.html
Answer last updated on: 10/11/2012