Posted: Fri Jul 3, 2020 11:03am
You could seal up the entire property and still some insects will get in or remain inside. I know when I visit Spain I pull out the fridge/freezer, washing machine, sofas, mats, etc and spray the livin' daylights out of everything. Also, I put down anti insect powder. My wife always elects me to do the usual deep clean where every floor tile is treated and cleaned. Mattresses need to be turned etc, some pillows dumped, under sinks disinfected etc. "U" bends in sinks, baths, toilets need special attention.
You can get pretty hard stuff too i.e. you seal up doors and windows with tape and spray/spread the stuff around and get out of the building for about twelve hours. When you return, wear an industrial face mask, clean up any residue and leave all windows and doors open for about an hour. Everything non human inside the property dies.