Directions to the pinball gurus

So I bought a Williams Whirlwind pinball that has been sat up for 10 years.
I've made a few small repairs to the electrics, changed the batteries, etc and all is sound.
I've bought a service kit which includes all new bulbs, rubbers rings, flipper rubbers, post sleeves, etc.
I've the play field completely stripped down to try clean 10 Years worth of warehouse dust from it.
The play field is 110% perfect, just very dirty.
The Mylar has a few bubbles and is a tiny bit peeling between the flippers and
I'm looking for advise on removing the Mylar vs keeping it.
Will removing it devalue the machine, what are the chances of paint peeling off, what's the best way to remove(hair dryer).

I'm not sure if there is many pinball guys here but maybe someone can steer me in the right direction

Oh and pics will follow shortly;)