Robert,
as Pepe says and I cannot emphasis enough the waxing/polish part. At the start of the season our previous smooth finish vans got a good polish, especially the roof and front. Our present dimpled van was treated to bobby dazzler. The result is paintwork stays good and cleaning is so much easier. 2000 miles worth of flies through France came off with a usual was and a spray of window cleaner. Only a spot of white spirit was needed for those tar bits you mention. If storing outside I would also advise an end of season polish.
Colin