Mosquitoes found inside the house can be killed with any good household spray that is sold for control of flying insects indoors. Space sprays or aerosols containing synergized pyrethrins or synthetic pyrethroids are effective.
An aerosol bomb containing pyrethrum is easy to use. Best results are obtained if doors and windows are kept closed during the spraying and for five to ten minutes after spraying. Only products labeled for flying insect control should be used. Residual spray products labeled for control of crawling insects packaged in aerosol bombs are hazardous if sprayed into the air even though windows and doors are open.
Be sure to keep the windows, doors and porches tightly screened to exclude as many mosquitoes as possible. Avoid spraying food, dishes and other eating utensils.