Thin layer of resin over FEP
So, after about my 6th print my FEP got a layer of grey resin over the whole of it. When cleaning out the extra resin from the tank I did manage to get the lower right corner "clean." My question is 1) do I need to replace the FEP? 2) Can I recover this FEP screen at all? 3) What caused this/ how do I prevent it from happening again?