weird oil/greece on inside of car windows and windscreen?

Chimp Theory

New member
hi, ok on the inside of my front windscreen, i have some kind of strange oil or greece which is making it very difficult to see through. i tryed wiping it of with water and a towel but it seem to just smear it rather than remove it. also it seems to dry into small white dots when the car is left out in the sun for a while, or is heated up. im not sure if it could be from people touching the windows with their hands or if it is somthing completely diffrent.
does anyone know what this substance is or how to remove it?? i was thinknig about trying white vinegar but thought id ask here first

cheers
 
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