A bit late in answering cecil, but I only ever use the old fashioned pink Windolene. I've tried other brands & methods, but you can't beat it! I bought mine from Sainsbury's.
The only trouble I found when I bought the last bottle, was that it was in a much 'thinner' pink plastc bottle with less grip! Sooo - when I unscrewed the lid, it seemed to spurt out covering my hands & dripping over the window sill - so beware!
Looks like we're not alone:
http://www.dooyoo.co....s/windolene-emulsion/