I've read in the past of several members recommending Aldi caravan wash shampoo whenever it becomes available. So what is it with this stuff that makes it so special over and above the readily available car stuff of which I've got plenty of?

Its very good Deeps, I use it all the time, it cleans the van very well. Depending on how dirty it is determines how much you use which isn't a great amount. You can also use it neat to get rid of black rain marks..