The difference is Sys11s are mostly not clearcoated and have known issues with mylar pulling off paint.

I would "trim the edge" with a razor blade, and then novus#2 it 5 times. It takes practice and is the much quicker DIY approach. The playfield coats on an IJ are fairly thick. Just make sure the blade doesn't touch the playfield! Don't cut the way your normally would through the material, hold the blade edge flat to the play filed to make a trim. I wouldn't do this to a CQ or a "museum piece" IJ but if it's just a "player", that's what I would do.

If you really do try this, make sure you practice on something else. All you really want to do is remove 1/16 of an inch at the black dirty part. Mylar tears/cuts kind of like strong packing tape. Knowing that helps.

Looking at your mylar again, I would make a cut from top Willie black key line to the bottom Willie black key line to remove the lifted/dirty spot.

(Mylar gets dirty spots because over time, the edges lift away from the play filed and dirt floats under it.)

Alternatively, you could completely clean out the black dirty part with the edge of a small rag and some novus #2, then just trim off the small, unattached sliver of mylar. That would be the safer and quicker approach.

Novus it a bunch using moderate pressure along the edge of the mylar cut and it it should become very smooth and clean if you use novus. You can really make old mylar look very good with novus2, just don't go crazy with it.

If you want to remove the entire piece, see my tips below.

I have had nothing but bad luck with heat. peeling inserts, pulling playfield paint, etc. If I ever have to remove mylar from my IJ, I will be freezing it with compressed air cans.

Yeah, if you're hell bent on removing the entire piece of mylar, use freeze spray, then flour, then goo gone with rubber or plastic helpers... per Vid's guide.

I have been doing this for 13 years so please follow my rule of thumb when you think that you "just have to remove that mylar"... DON'T DO IT UNLESS THE PLAYFILED LOOKS VERY BAD. The chances of something going wrong when removing mylar is VERY good, no matter the age of the game, or the amount of experience. There is very little chance the playfield will look any better OR play any better at all if you remove the mylar. The few times it does help is usually if the mylar itself is in very bad shape.

Obviously, if you are going to touchup and clear a playfield, mylar removal is to only way to go.

Pretty much every WPC game I have ever owned that had mylar on it pulled off easily by hand and left no ill effects at all.

I pulled the mylar off my IJ. The inserts came up.

If you reverse a can of compressed air it will come out has freeze spray. Spray the mylar a few times and let it sit for a few seconds. Pull the mylar a bit a spreeze spray again. Spray under and above the mylar as you are moving along. Pull a bit and freeze spray again.. After a while the glue will hardened by itself and you could safely remove the mylar. Again something is never 100% guaranteed but Iève gotten really good results. Patience is key here.