How to clean the small heki rooflight

Ageing Dj
Ageing Dj Forum Participant Posts: 36
edited March 2015 in Caravans #1

The  small heki rooflight in the washroom has aquired dirt and leaves inbetween the two layers of the rooflight which apear to be permetly vented. How do you clean between the two layers, getting in via the grills seems awkward, any ideas short of dismantaling it please.