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"Pressure washers damage tyres"


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High-pressure washers, as used at hand car washes, can damage tyres, warns industry organization TyreSafe. The high-pressure water jets can cause damage to a tyre's sidewalls, especially if the water is hot and if strong soaps or detergents are used; these can remove protective chemicals embedded in the sidewall.

Research by German safety group DEKRA has found that serious damage can occur in just five seconds; TyreSafe says that "even tyres that appear normal after being subjected to a pressure washer may have microscopic perforations, which can weaken the sidewall and cause a possible blow-out." It suggests that only water pressures of up to 110 bar or less should be used, with the washer jet nozzle held at least 20cm from the tyre surface, and that a fan nozzle (which disperses the jet) should be used to clean tyres rather than a circular one. The water jet should not be held on any one area for a prolonged time, and should not be aimed directly at the join between the tyre and the wheel rim...

From http://www.channel4.com/4car/news/news-story.jsp?news_id=15691

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