Hi jrpask,
I have a wife. I guess that makes me a family man.
I'm afraid you are in a bit of a pickle here. You are being ask for a solution here or at least an explanation of why this is happening. At least that is what you think you are being ask, but it may not be. When men are presented with a problem we assume that we are being ask for a solution. When women relate a problem they are often only want you to listen and provide emotional support.
I'm sure your wife doesn't want the brownish/greyish residue. At the same time she wants to clean the dishes in a way that she emotionally feels is best. Logic will probably not dissuade her from that. If it would, she would have at least tried leaving out the rinsing agent.
If you are going to get rid of the brownish/greyish residue you will have to determine what is causing it and demonstrate it. And even that might not work. You will probably not be allowed to try different things to determine the cause so you will probably have to try different things when she is not around.
From a logical perspective the residue could be caused by:
1. A chemical reaction between the Palmolive dish washing detergent and the Cascade dishwasher detergent. Possible but not very likely.
2. A chemical reaction between the Cascade and the rinsing agent. This seems quite likely since the manufacturer says not to use or at least says it is not necessary.
3. The residue could be a reaction between the rinsing agent and the heat of the drying cycle. Or it could be a reaction to the combination of the Cascade, the rinsing agent and the heated drying. The heat drying only speeds up the drying process and unless there is a need or desire (I want to put them away and be done with it) seems unnecessary to me and it cost money. It is also not good for glassware. Over a period (granted a long period, like years) glasses become more brittle from the repeated heating and break more easily. Up to you as to whether you want to go down this path though.
4. The residue could also be a result of a chemical reaction between the rinsing agent and the metal of the pots and pans.
You could go through a process of removing one thing at a time to determine the exact cause but you will probably have to do it in her absence.
You could suggest changing the brand of rinsing agent. Not eliminating it, just changing the brand. She is not going to give up the Palmolive, the Cascade, the use of the rinsing agent and not likely the heated drying cycle, but she might change the brand of rinse.
If the use of the dishwasher cleaning agent removes the residue from the machine, that would also be a pointer to the rinsing agent or the rinsing agent and the heat combination, being the culprit.
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