While agreeing entirely that it was daylight robbery to want to charge £46 to flush out the screenwash system ("Car Clinic", pM8, 16th October), may I suggest that it may save the health (or even the lives) of some of your readers if you were to find space to point out that the risk of not using screenwash additive is not just nasty smells.

A Telegraph article (www.telegraph.co.uk/health/healthnews/7825841/Car-windscreen-spray-raises-Legionnaires-risk.html) mentioned an estimate that 20 per cent of cases of Legionella were caused by contaminated screenwash systems where no additive was used. The ventilation air intakes are usually just below the windscreen, in the ideal place to take in fine droplets from the screenwashing jets for the occupants to breathe in. The commercial additives contain alcohols that are quite effective bactericides for bacteria like Legionella, which don't form resistant spores. I hope that you will take it as a compliment that I think a warning from you would probably reach more readers than did the original article.