@Feroz, from your description it does not look like fogging, but a case of water adhereing to the glass surface - though fogging may be an underlying reason or contributor. It happens at times that when the windshield is wet and cold (as a result of fogging/rain and cold weather), using the wipers does not completely remove all the water - some of it is left behind on the windscreen as a thin layer or sheet of water (the water literally sticks to the glass). The worse part is as the wiper sweeps across, this sheet also gets spread along with it. I have seen this in my santro too particularly during rains - and the solution is to heat the windscreen or put water over it. You see the water than comes out of the spray is warmer and therefore this thin sheet gets removed with it, only to reappear after a few moments.
Its not that the wipers are not working - they are but this layer is formed from the water that is transferred from the wet wiper blade to the glass. Since this water is basically the residual left on the wiper blade's edge after it has wiped off the majority of the water (meaning the wiper will not be able to remove this residual by its own motion), as the wiper sweeps across this water rubs off onto the glass and gets deposited as a thin layer which ends up looking like fogging.
 S = k.I^2, where S is the amount of stupidity a species possesses, I is the intelligence the species has and k is the universal constant of stupidity.
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