Agree with the earlier posts that getting a cat is really the only way to be mostly rid of them.
Relocating them is about the same as trying to dig a hole in the bottom of the lake. There are so many of them, and they reproduce so quickly, that as soon as you remove some, others will move in to take their place. You are wasting your time and money with this approach.
Either learn to tollerate their presence, or get a more permanent, lasting solution (aka: Cat)
