A home remedy that you may want to try is cleaning vinegar. I found it locally at Wally World. Run the dishwasher empty, and after the initial pre-rinse and refill, dump a healthy dose of the vinegar into the water and let the dishwasher finish. The problem area is most likely in the water return sump beneath the strainer in the bottom of the tub. Also, if you're good at taking things apart (and remembering how they go back together), you can remove the lower spray bar and disassemble what's below it to get into the sump area to clean it with a small brush or whatever will do the job. Until that sump is clean, you will continue to have the smell return.