Here's how you do it! Mix one cup of vinegar in one cup of hot water in a measuring cup or bowl. Set the microwave timer for 5 to 10 minutes. Carefully remove the hot liquid and then wipe out the inside with a wet rag. Another excellent solution is i/2 water and ammonia solution. this will also leave a shine on everything. Another great shine treatment is to fill a spray bottle with rubbing alcohol and use it to shine all the appliancea in your kitchen by spraying and wiping with a microfiber cloth. This solutions are handy to use and usually available in your home already. Not to mention they are great disinfectants!