i use fleetclean - got from e-bay £16.00 for 25 ltrs use it at 5 to one from a spray bottle ( pump up/pressure one ) and spays upto 15 ft.
WW Help yourself - not sure of the quality, just took it with the mobile.( send the royalty cheque later LOL )40 mins start to finish - All three sides were like that - that goodness the sl2 was nice and light! Darran can i also use that pic......top job mate.