They do come off via clips, but it has been way too long since I have pulled them. Let's see if someone else knows exactly.
A milky window section means most likely a fogged glass. You might be heaed for replacement. This usually is from the rubber glass seal being so old as to let moisture in and to collect. Rule of thumb: If you pull or push on the rubber and it doesn't snap back immediately, its time to replace it.
If the wires run through the glass from top to bottom, it is my guess then the connectors are also top and bottom.
Keep us posted,
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)