Just By Using Cleaning Solution Your Disposal Will Be As Good As New
The advice of some experts would be to spray the solution down the drain, let it sit in there for a good period of time, take a brush that fits and then scrub it.
When you’re done just flush it with some warm water.
If you want to do the job right and disinfect it properly, purchase a cleaning substance that has bleach in it, that way you can kill the dangerous bacteria such as salmonella or E.coli, that’s been sitting in there for some time.
Remember to clean it every once in a while, there’s been lots of nasty stuff in there.