Hi, You wont really see any difference when claying, its the later stages when you notice i.e once you have polished and waxed. The clay cleans the paintwork of tar,sap diesel etc etc, then you need to polish then wax it just gives you a flawlessly clean base to polish then protect!! b ut as said shouldnt take longer than say 5mins a panel really, otherwise you may mar the paint and that will mean youll need machine polish to correct. Pete