we had a chemical fog before, very troublesome but the problem was bad and we had to destroy it before it got worst.
they seal up your apartment, seal the windows and all outlets, spray on the bed, sofa, cushion and generally everywhere, and you have to leave the apartment for hours.
i forgot we have to stay away for 3 or 4 hours.
its not 100% but luckily for us, the bedbug problems went away.
my friends were so luckily, he had to throw away all his sofa and beds.
