Noise in render of transparent object

[Bas]

Hi Guys,

I hope somebody can give me a tip how to remove noise from a POV-ray render of a glass object.

I made the model in LDD, exported it in LDD and converted the model with LDview to the POV format.

I used ambient lighting (3 standard light sources changed to ambient lights).

But as you can see the transparent train window shows noise.

Does anyone have a tip for me to reduce/remove the noice?

Thanx!