i do understand the desire to be rid of them, as they can overpopulate and sometimes be unsightly.
however, think of them as teeny tiny canaries. they do a great job at eating leftover food, algae, etc, and they require no special care from you in return. in addition, their best advantage is that they are a sign of a healthy tank. if they are overbreeding, you are overfeeding. if they die off in massive numbers, you have a water quality problem. they are a great way to monitor the tank's health.
if, however, you do want to be rid of them, the best way is to put in some lettuce or zucchini in the evening as it gets dark. just before you go to bed (assuming it's been a few hours) remove the pieces with the most snails, put in a ziplock bag with some water, and put in your freezer. in the morning, remove the other pieces and repeat. this will get rid of most of them. the only way to be rid of all of them is to use an invert-killing chemical, which may harm your fish and leave residue in the tank.
i sincerely ask you to freeze the snails overnight before discarding, as many pest snails can live out of water for days, if not weeks, and if they end up in local waters they can overwhelm local species and cause real problems. freezing is the most humane (if you're worried about that) and easiest way to avoid this.