When I had the door panels off to install my speakers, i noticed theres a plastic sheet on the door. I was wondering what the sheet was for and if I need it. Mine is kinda coming off, so if i need i need to fix that or if I don't need it I'm gonna take it off.

 

uhh its j ust for like waterproofing and stuff...its not a big deal just put it back on with some wall tack if u need to put it back (poster tack).