Moths are attracted to light and things that reflect light. Here's an easy and simple way to get rid of moths that swarm around your front and back patio doors.

Place a bowl with water and a few drops of dish liquid by each door. When you turn on your porch/patio light the refelction of the light will bounce off the surface of the water thus attracting the moths and trapping them. The heaviness of the soapy water weighs down their wings and after a day or two you will notice that you've accumulated quite a number of moths.

Depending on how many moths you attract you might want to change out the water every few days. Dispose the water by throwing it out in your yard. This way you're recycling the water and it's good for the grass as well as the enviornment.