The comments saying that other sources of water need to be removed are spot on. Another technique I've tried which works (observably) well is described in this video: https://www.youtube.com/watch?v=6BhV-o77RqQ tl;dw: Get a big drum fan with a screen on the back, attached with small/powerful magnets. Mosquitos are such poor flyers that they get pulled against the screen and can't escape, and they pretty quickly desic…
On a larger scale, there's this https://www.youtube.com/watch?v=AI3HE7BcIBk&pp=ygUQbW9zcXVpd... about mosquito factories