Baking soda is an excellent choice for helping drains stay clear because while it is alkaline—a pH of 11—it isn’t as caustic and damaging as the commonly used lye-based commercial products.
Ideally, use baking soda on your drains once a week to keep them clear. Just pour 1/4 cup or so down the drain, and then flush with water.
If you still have a clog, try pouring down 1 cup of vinegar. Being an acid, the vinegar will neutralize the baking soda and there will be some foaming and gurgling, but sometimes this agitation is all that is needed in the end to dislodge the grime.
To keep your drains smelling fresh, toss your lemon peels into the garbage disposal after you make home made lemonade, brighten your seafood or bake a delicious lemon meringue pie with fresh lemons.