I would strongly suggest that after a few days check the caravan again. If there is still some residue left, it will show up where the dust has settled on the caravan.Well I got the awning back in its bag which left me covered in sticky stuff as well.
Got home and washed and cleaned the caravan and then unpacked the awning, getting covered in the sticky stuff again. Hung the awning on the off side of the caravan and then with a bucket of hot soapy water washed it down with a soft brush. All the sticky stuff appears to have come off. Now waiting for the proper awning cleaner and reproofing stuff to arrive.
Note to self: Learn what trees drip sticky stuff; Avoid pitches with these trees.