We have some condensation (see image) marks beneath the Truma vent on our Adria Twin (PVC) I've now bought a spout to direct the condensate away from the van. The marks left though are proving difficult to remove. The paintwork, vinyl decal and vinyl trim are all affected, any ideas for how to remedy this. We also have some scratches on the vinyl decal courtesy of an altercation with a bush on a narrow lane. Again, any suggestions for how to repair these will be gratefully received. Thanks.