water wetter
OK, when I made my final comment I was still thinking in cast iron terms.
Do not use Cascade liquid in a system that includes aluminum heads, block, or aluminum components such as the timing chain cover or thermostat housing. Liquid detergent is alkaline and would corrode aluminum. Using a sacrificial anode such as Zinc might work.
Fabric softener is not alkaline and should be safe. I will check this out Saturday.
I am scratching my head over the term "Metal Deviators" and what is claimed that it does. I will try to find a bottle of the stuff and see what the label says. The JB website does not use that term.
Autoxcuda has the right idea. Best to be safe and use a product designed for an automobile application.
Changing the distilled water and treatment solution at least once a year is a good practice.