Roof vent

[godfrey1971]

Hi all , I've taken out one of my roof vents for resealing and noticed a lot of dirt between the outer and inner skin due to the shape of the edges you can't prod any thing in between I've tried agitating it while under water but can't shift it , anyone got any ideas?

 

[Parksy]

You may be able to dismantle the rooflight by removing the screws at the base of the sprung arms and carefully pulling the arms away to separate the top and the bottom layers of the rooflight. The screws may be the star shaped (torx head) type.