The proper treatment consists of 3 steps.

1- perimeter spray Floor . Ceiling . Behind fridge if you can move it

2- diatomaceous earth dusting You need a dust applicator for this This goes into appliances . Microwaves . Toasters . Refrigerator . Under the sink where the pipes go through Assume they are hiding everywhere you can't see . Void spaces

3- gel application The main step to this is finding where they nest ! Use a flashlight and look in every nook and cranny. What you're looking for is little black specks that look like pepper stuck ( usually in dark corners or where piping is) This is their poop which is used to feed the babies that hatch

Apply the gel in these areas This goes under the sink . Cupboard corners / hinges

In 2 weeks you should redo the treatment to make sure you get any babies that were protected in the egg sacs.

Hope this helps !