Description Winter Long Protective Wash for Caravans, Motorhomes, Camper Vans and Boats. It creates a bio-static film which helps protect against dirt, algae, excessive water, tree sap and traffic film. . Directions:   Winter Long is a Caravan/Motorhome cover in a bottle. Apply before you put your caravan or Motorhome into storage or when it is not in use and wash off before you go away again. To use put half a bottle in a bucket of water and apply to caravan or motorhome using a sponge or brush. The special formula creates a protective layer over your caravan during storage.One bottle should be enough for two uses, depending on the size of your vehicle. .