1.- No, there is no risk of reaction of Optimum Car Wash. You can certainly use a mitt as well.
2.- The only problem is you will be diluting the Iron X before you agitated it. You may very well be fine in doing so if its not much contaminants but if it is then after you agitate it you will have also rinsed it mostly away and rather than being able to just let it sit another minute you would have to re-apply IX... Again, I`m a bit more detail oriented than most so maybe fine for you.
Thanks!
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