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</p><p>We all are used to see a wiper on the rear windscreen of the hatchbacks, MPVs and SUVs. However, the same is not seen on a sedan. Ever wondered why so? &nbsp;</p><p>The reason is aerodynamics. Yes, you read that right, entirely due to Aerodynamics. </p><p>When a car cuts through the air, there is an immediate vacuum created just behind the rear end of the car. And just as it moves ahead, air turbulence is left behind at sides of rear end. With vacuum in between and turbulent air on sides, the rear end of a car becomes an area where dust particles are sort of pulled towards it. In the hatchbacks, MPVs and SUVs, the rear windscreen/tailgate is where the car ends, hence the dust particles which are pulled via vacuum make the windscreen quite dirty which hampers visibility. Hence the need for rear windscreen wash and wipe function.</p><p>But in the case of sedans, the rear end is actually the end of the boot, which actually guides the air over the rear windscreen. The vacuum in this case is created just behind the boot which attracts lot of dust and dirt particles but the rear windscreen does not get as dirty. This explains lack of rear windscreen wipe and wash. Furthermore, it’s not feasible to integrate rear wiper on a sedan as there’s no direct linkage between the boot and the rear windscreen. &nbsp;</p>However, it must be noted that rear wash and wipe function is equipped on cars such as Skoda Octavia and Superb which have the rear windscreen opened along with boot. For some strange reasons, this does not make its appearance on the Indian variants, but on European ones, this is provided as a safety feature. In the past, cars like Hyundai Accent Viva and Skoda Octavia had this nifty feature. &nbsp;

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