1. Throw Your Leftovers in the Trash Can, Not the Drain When it’s time to clean up, resist the urge to simply scrape the leftovers off your dishes and into your sink. There are a lot of foods that should never go down your disposal (more on that in a moment), and if you don’t have a disposal, you definitely want to be careful about what goes down your drains. One of the easiest ways to prevent unwanted leftovers from going down the drain is to use a simple, inexpensive sink strainer. Once you’re done washing off your dishes, you can simply dump the collected waste in the garbage or compost. ...