Perhaps I'm just noticing this because of the big white column in the center of the playfield but it sure seems like my new Tron gets dirty really quick. I admit that when I first took it out of the box I didn't do a complete wipedown of the playfield & ramps mostly because my kids were standing right there wanting to play it. Then, of course after they went to bed *I* wanted to play it!
After a couple days I could see lots of little back dirt marks right in the center of the playfield. So, this morning I pulled the glass out and cleaned everything up real nice. Sure enough after about 5 games it's totally dirty again! I don't seem to remember my other NIB games getting dirty this fast.