i have a e280 avantgard 2000 2.8 petrol,in the winter the windows get wet in the morning and a long time to dry can you help please

 

What you have my friend is a water leak from the outside. I would suggest you find a engine smoker used for finding vacuum leaks and turn it on and put a positive air pressure from the window into the interior. If there is a plug or corrosion letting water in, you will see smoke coming out of the vehicle.

Also, inspect every square inch of your vehicle inside a garage after driving though a horrid rain storm. Wetness will indicate where the water is leaking in.