· One petunia in a field of onions
Not sure if it's available in ol' Blighty, but there is a cleaning product made from citrus oil which works well. Citro Clean is the best one I've found. I use it for removing glue left from vinyl graphics on vehicles, signs or banners that require changing. Otherwise, Prepsol would be the next thing to try. Another product that I use on vehicles to remove tar and such without damaging duco.