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My arms simply aren't long enough to reach the whole thing and I have a bad back. So how do you reach the entire inside of the windshield with paper towels and spray?
You use a microfiber towel with your prominent arm. Position yourself in the driver seat side and passenger seat to wipe the windshield.
Model 3 is a lot easier since it doesn't have a large cluttered dashboard. Put one hand on the dash and wipe whatever side your on and then switch to the other side
I asked the exact same question about a year ago. I can vouch for the Invisible Glass solution above. Also their cleaning spray and water repellent solutions are excellent.