But a dishwasher cleaner like afresh , you might need to do it more than once . Or you can go to the dollar store and get a back scrubber ( soft bristle ) then take out the bottom rack and use very hot water , with a little white vinegar and a drop of dish soap , then scrub away !
Vinegar! Here's a link:
Here is a link that might be helpful.
Additionally -The commercial dishwasher tub cleaners found at the supermarket work very well. Afresh is one of the brands Ive used.
I have used a product named "LemiShine" which is powder that goes into the bottom of the machine and then you place your regular D/W machine product in the little receptacle in the door.. It has worked well for me for many years. I don't use it with every wash but you will know when it is time to do it again. Hope this helps ! Granny Beth, Austin, TEXAS !