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Our 2004 Argente 460/2 has developed a problem with one of the window units. It's not the normal looking condensation that we can see rather it's marked similar to fingerprints. It's definitely inside the unit and we do know what slight condensation looks like as it appears in the other windows at times. Has anyone had or heard of this before?

Thanks  

Tigerman                                                                                                                                                                                                                                                                                                                     

does this mark vanish if the sun is shining on the window ? if it doesn't then it cant be condensation if it does then it would seem that the seal between both layers has broken somewhere.

other than this I dont know what to suggest