I'll answer on Mike's behalf since he's out in the Show Car Garage doing inventory for the upcoming SONAX class in Indiana.
One dead giveaway for the overall quality of Wolfgang Total Engine Cleaner is the fact that it doesn't need to be rinsed off. You can absolutely rinse it off if you'd like (which I would recommend for heavily soiled engine bays), but for light cleaning (as demonstrated by Mike in this article), you can wipe it off using a microfiber towel.
If you plan on cleaning an engine that's covered in oil and sludge, I would choose McKee's 37 Engine Degreaser. For the every day driver, Wolfgang Total Engine Cleaner is tough to beat.
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