Half a croissant, on a plate, with a sign in front of it saying '50c'
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Orion windscreen wiper

Blow the rain away
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A continuous sequence of explosions creates a powerful shock wave in front of the windscreen, forcing raindrops away from the glass.
pocmloc, Mar 04 2013

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       // But it might force your car backwards//   

       That's pretty trivial to solve. Simply detonate a slightly larger series of explosions behind the car so that the net forward motion is manageable.
bs0u0155, Mar 05 2013
  

       Also keeps the rear screen clean! Win-win!
pocmloc, Mar 05 2013
  

       To park the car, simply detonate equally sized bombs every 2-3 seconds. This will also render your car unstealable... although the neutron flux may deteriorate the paint over time.
bs0u0155, Mar 05 2013
  
      
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