Recently I was in a caravan accessories area of a shop and looked at the Fenwicks Black Streak Remover. I hadn’t realised that when the sprayer is empty the label says to fill with Caravan Cleaner to the lower fill mark and then top up the sprayer with water. Seems an expensive way to buy the fluid and spray bottle. I’ve always used Fenwick Caravan Cleaner to clean the van and then a 1:10 solution to work on black streaks. This is described on the Caravan Cleaner label and which works very well, and did so this time.