Will the sliding roof light lift out?

[SilverSurfer]

The roof light on my caravan in the type which hinges a couple of inches then slides back.
Can it be removed for cleaning? I have had several attempts to look for retaining clips but can't see any, obviously I don't want to put undue pressure on it for fear of breaking the plastic.
Thanks

 

[Sparks1]

If it's the same as mine (although mine slides forward) I too would like to know how the window is removed. I needed to take the whole unit out to re-seal but as I couldn't get the window off I was only able to seal three sides by sliding the sealer gun into the gap.
I don't know what make it is. It had two festoon bulbs each side of the inner frame and has a net screen and a blind that slide from opposite sides. There is also four removable vents (two front and two rear).

 

[Sparks1]

It looks like mine is a Remis or Remitop or Remistop (various spellings) 600x900
Here's an inner frame
Now to see if I can find some instructions.