Yep - I was going to saythe same - I have an Aug'04 build car, and the Xenon washers take a bit of hold on the stalk to get them to activate (as do the windscreen wipers i notice

).
As for how often they wash the headlamps after that (i.e. without switching the engine off and back on again) I haven't figured out yet...
They also wash the headlamps if you only have sidelights on...
