I have a similar problem; pag mating season eh ginagawa nilang love nest yung area near our water tank. What I did was I took my son's Nerf water gun and put in a 50/50 water-vinegar solution. Everytime maririnig ko yung hiyawan nila, I 'snipe' them para mabasa with the solution. After I hit them I spray the areas they frequent with the solution. They never came back, so I guess it worked kasi sa next mating season nila eh di na nabalik sa house namin (yung neighbor namin a few houses away ang ginawa love nest though lol).