I hear constantly putting vinegar in the rinse box will pit /corrode it
It’s plastic I don’t see how, you can buy commercial rinse aides, both Cascade and Finish have them, the Cascade works better than the Finish from my experience with it.
White vinegar is used to clean coffee pot mineral build up all the time. I use it in the rinse aide box of my dishwasher and have had no problems.
Vinegar is a very good product with multiple uses google it to see some of them.