Winter cover marks on caravan- any suggestions?

A good proper caravan shampoo usually does the job, other than that some of these waterless car wash polishes brings mine up a treat!

Thanks for your suggestion. I have been using Fenwick cleaner and rinse maybe I need to try the streak remover too.....

Try one of those magic erasers

A very fine compound like T cut or even a cream cleanser, then use a really goof quality wax to buff and protect the newly worked surface. 

The t cut sounds like a possibility as does the magic eraser.  it does however make me nervous. Will the paint on the van not be too thin to cope with it....?

I think I'd be rather cautious on any form of cutting paste, which is what T-Cut  is, as caravan paint is much thinner than than conventional paint on a car. One of the liquid polishes such as 'Mer' that cuts through oxidization would, I imagine, be sufficient for the task. I'd at least try something like that first before more extreme measures.

Another old bodyshop trick that works for me is to pour two or three capfuls of "T" cut into bucket of your normal shampoo and wash the affected areas with that . It has a very mild abrasive action ,but in my experience does not damage the paint surface - like everything, use in moderation. 

Then buff / polish with your normal polish - I use Autoglym Deep Shine 

Try autoglym car Polish.  I guess lesson learnt don't use a cover!

Thanks for all the suggestions. I  think I'm going to pick up a bottle of Mer on the way home as recommended by cyberyacht to try at the weekend. Anything more abrasive makes me extremely nervous.  Will think twice at the end of the year when it comes to tucking her up in the "sleeping bag" can't believe something that I researched so carefully has done more harm than good? ? ? Will update with the results... fingers crossed