You mean they still have one? I know back in the early 2000's all the block paving [certainly in Forbidden Valley] got jet-washed in the week or two prior to the start of the new season to shift all the winter muck off it. That stopped in about 2002 - I remember one of the Air Press Days & a guest / journalist commented to Ralph Armond that the paved pathways looked mucky. His comment was that they were "being cleaned next week". Maybe Mr Manana the maintenance man started that season! That said, in Ralph's defence, the Valley was a building site until about 5mins before the guests arrived on opening day (as was X-Sector 4 years earlier!) so getting the cleaning done may have been difficult with contractors vehicles everywhere.