I am terrible about my garbage disposal. I’ve never had one before and do a terrible job on upkeep. To keep your garbage disposal from getting smelly, NEVER put meat or grease down it. I don’t think it breaks down as easily. Also, after you use it, be sure to run a good amount of hot water down after it to rinse all the junk down.
Now if you are like me and you don’t do either of those, here are two ways to make it smell better. First, to get rid of the stench, pour down some baking soda and then some vinegar. Various places suggest 1/2 c. of each. I typically eyeball it and it’s probably more than that :). Let it sit for a while and then rinse with hot water.
If it’s not that bad, you can always process some lemon slices down the garbage disposal. I like to follow up the baking soda, vinegar volcano with them so when you turn it on, it smells good.
Not having a stinky garbage disposal works for me!