Thanks for your replies. Dzahm, do you mean just plain body wax? Had thought about trying to use Vaseline but wax would probably be better. And then it
I attached my wand to a piece of 12 gauge insulated copper wire - household electrical wire - so I have flexibility and stability of the wand. Seems I can get the wand everywhere like that.
After taping everything, thought I'd put a small hole in the vent tape and spray straight up. Then use the wiper hole in the middle of the car and shoot to both sides and finish from the drain ports. I think with my wand setup I will have control and be able to spray everywhere.