Having had the the skylight on the campervan resealed a few weeks ago. The water proof tape i'd put on the surround to slow down any water coming in. Long enough to get something to catch the rain when on site. Had left a right old sticky mess once removed. So just spent a good few minutes with a cloth and WD. A combo of WD and the small bit of fiction from the cloth soon had it looking clean as a new pin. All in all one of them repetitive little sort of jobs that ends with satisfying result.