In my truck I constantly hear this eerie screeching and scratching everytime I roll up/down the window. It is due to past mudding, and friends rolling them up and down. I really would like to know the best way to prevent this in the future (what sealant to buy/look for, links to the product if possible or pics), and if a sealant won't work well, then is there any makeshift tricks any of you know to prevent this on my future vehicles?

Kinda like this thread.