As lightsphere mentioned, take the wheel off, it will give you a lot more room to play with and clean all the gubbins underneath. When you replace the head light back into the sliders make sure you don't snap the plastic lugs on the head light. If there is distortion you may find the head light goes on one slider only, so the next time you replace the head light the lug will have worn away with vibration.
Stick a bit of grease in the sliders, don't over tighten the heath robinson adjuster, as this will crack the inner casing of the head light. When all back together cable tie the clamp to the body of the car, because if you loose one, they're about £120 each. Learned from bitter experience.
Good luck with the head light adjustment.
Aerotaff.
I am guessing adjusting them is a faff?
