why got this kind of question 1 
next time before you go out, close all windows, then start sprayin,
corners, under the bed, table, those dark places in your room,
spray liao off light and go close the door then happily go out.
Should be able to kill a few of them
i realised they like to hide in those messy places, or under the
desk (dark), or messy book shelves, or around the hanger (the type
that is attached behind your door)
the top record in my house is 30 mosquitoes within 20min in a room
