Interesting stuff. I hope it works well for you. You could route the windshield squirter onto the sponge and fill the tank with plain water. But then, you wouldn't have it for the windshield... Hmm...
Brilliant indeed! I thought about it, and figured that I need the solvent for Winter driving only, which is when I don't need the sponge -- perfect! Water only in the summer months.
(Thanks for bringing up this old thread -- I forget sometimes what we have here)
I have to get under the hood (or check the shop manual), but there may be a happy medium here. I require at least water to the front windshield for muddy road spray. The rear wiper isn't a big deal in the summer, and should have its own pump. Oh yeah