After two harsh winters I'm worried about the effects of road salt on my cars bodywork.

Are there any products that you recommend that remove the road salt film from a car's bodywork, chassis & underbody and that prevent the acceleration of corrosion of bodywork, chassis sub-frames, suspension components etc?

Back in Australia a company called Staun used to sell a product called 'Salt Assault' which was popular with mining companies. You could wash your cars bodywork and underside with it, but it doesn't seem to be available in the UK.