https://www.amazon.com/Bayer-Suspend-Insecticide-Roaches-Professional/dp/B002Y57MGE/ref=pd_ybh_a_1?_encoding=UTF8&psc=1&refRID=AW098DW2BMKNAP70T3Q7Very easy to use and very safe when used properly. I have a 2 gallon sprayer with a fine spray tip and it works great. I spray the entire outside of the camper and inside, I spray the floor as well as the inside cabinets where I can get to. Yes, obviously you have to remove whatever is in the way so as not to be sprayed until it dries and then move it back in. I used to pay my bug guy to do this and then realized how cheap the product was. You do not need a license of any kind to spray your own property. This is an over time killer. The bug passes over the sprayed area and brings the poison with him to whatever nest there is and later dies.