I don't have any personal experience with this one, but I'd guess the
technology is similar to the Bar's Leak. My guess would be that if the BL
doesn't work, this won't either. You might Google it, call the manufacturer,
and pick their brain to see if there really is a difference.

If you try it, the hard part is getting ALL the coolant out. If you don't,
you end up with a mass of green gunk with the consistency of jello.