Could your correspondent MS use half a potato to clear smears from his windscreen?

Regarding MS's email on page M7 of Telegraph Motoring about using Cif on his windscreen; I use a potato cut in half and the exposed part rubbed on the windscreen, followed by the screen washer/wipers to get rid of most smears.

Asked on 5 February 2011 by RJ, London N14

Answered by Honest John
None of the standard cures including toothpaste, Mer, Autoglym, vinegar had worked. That's why he resorted to Cif. But, as I advised, anyone trying this must be VERY careful not to get Cif onto the car's paintwork.
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