Despite all the good advice from @Charlie and @FJmike on here , I had never got round to buying some G101 . Anyway a week or so ago I had the van exterior including the roof cleaned by a reliable outfit . The van was a bit more than grimy as we had done a fair old mileage in previous weeks . including on salted ,gritted roads. As part of the process the guy used G101 for the stubborn mucky bits on the vehicle body ,using a well diluted mix . The results were excellent , all dirt vanished , even on the plastic off white locks on external lockers ,which I had over time unsuccessfully tried to clean . After the clean , I went on ebay to get a 5 litre container of the stuff. Most of the prices were in the £30ish range , one or two over £40 . Some of the the actual products descriptions also seemed a bit "questionable". So I decided to contact the local rep for autosmart . Result being ,,,,,,,,, autosmart mobile shop lorry appears at my door. £20 inc of vat for 5 litres of genuine G101 . Also bought a couple of other bits and pieces ............. Going by the dilution rates of the stuff , the 5 litres will see me ok for years.