There are products available where you spray the product into the fresh air intake (
near the windshield wipers), while the fan is running full speed:
I would suggest two items to the manufacturer: 1) the hood
slope near the windshield needs to be eliminated or treated so that the glare does not bother the driver / passenger, 2) a blindspot corner mirror on the outside mirrors would help with the blindspots.
The Zipcard acts like your key to the cars you reserve: just walk up to your chosen vehicle in the lot, scan your card across the
sensor near the windshield, and the car will unlock.