Staff and wine were just excellent and the estate ...

Staff and wine were just excellent and the estate couldn't have been more beautiful. During the wine tour, though, our guide explained that CrossKeys practiced self-proclaimed organic grape growing. I immediately noticed a residue on the grapes and leaves that looked different than the naturally occurring bloom and even signs that read "Pesticides" and a diagram showing the reader to not touch the grapes with their hands.... The guide was just as confused as I was. Some clarification would be nice!