Does Prop TKS sling enough fluid onto cockpit windshield to keep it clear as well?

I do never use the explicit windshield TKS, because up to now the TKS coming from the prop was enough to keep the windshield clear.

Mine certainly does. That’s all the “full TKS” system gives you. The spray bar is for brief use only; the pump is rated at a low duty cycle. It would empty the tank really fast.