About three years ago when I purchased a new BMW I agreed to dealer-applied paint protection. I have been pleased in that it seemed to take away the need for polishing, which was surprising as I am particular about the cars appearance. I now feel it is time to renew this in some way and I recall you have recommended various cleaning aids and polish (perhaps Autoglym?) Could you advise me what I might use for this and for a secondhand Fiesta I have recently purchased as my partners car? Also, the Fiesta will unfortunately be sitting beneath silver birch trees in the driveway so will have sap from them in the summer.