Ultrasonic Windshield "Wiper"

While not an overly big deal, any driver knows that windshield wipers can be a pita. It can be drizzling out enough to effect vision but not actually "raining" and the wipers will make an annoying squeek. When wipers are reaching the end of their useful life, it is always made apparent by their decreasing efficacy (and usually streaks left behind). When it's obvious theyre no longer effective, it means another trip to the local Autozone; which as mentioned is another merely minor inconvenience. But nonetheless, I think it could be easier.

Ultrasonic transducers vaporize most, if not all, liquids they come into contact with, because the liquid medium "tries" to follow the rapidly moving sound waves and vaporizes instead. Mount a somewhat powerful stationary transducer (even very powerful transducers do not consume much energy, fyi) somewhere on the windshield, and I figure you could instantly vaporize any rain, snow, etc that would come into contact with it. Youd probably still need a backup wiper for snow, some instances of dirt, etc. But overal, this would certainly be a simpler, cheaper, probably more effective alternative to the archaic sweeping wiper. Also, ultrasonic transducers are used as cleaning devices by literally vibrating dust and dirt particulates off of a surface and into a liquid. Thus, except for cases of major vision impairment from dirt (getting mud all over a windshield from offroading for example), I feel that this would still retain the ability to remove dirt and etc. Thus, this device would retain nearly all functionality of a wiper while eliminating all of the inconveniences of wiper maintenence.

Note: the ultrasonic functioning is not limited to a stationary transducer and could also be applied to existing wiper blades to aid in ice, rain, dirt removal and etc to improve functioning and increase longevity.