Getting Rid of Snails?
You can use copper stripping. If you put it around your plants the snails/slugs will die. You can also sink a dish into the soil with beer and they will go after it and drown.
Other Uses for Laundry Detergent?
I have used Dawn (or other detergents) and made a sudsy concoction with warm water. This I have sloshed over my plants. It keeps the aphids and other bugs off, especially with impatiens. Where I lived before I brought in quite a few of these and they bloomed...
Bringing Houseplants Back Indoors For The Winter
Before bringing my plants in for the winter and also keeping them healthy throughout the winter months, I slosh soapy water all over them. I usually use Dawn dish washing detergent. Ive used this on impatiens and it keeps the bugs off.