What causes ball trails? I have a new (to me) TSPP with a playfield that glosses up to a perfect shine, but after a dozen or so games I start to get ball trails. I have cleaned the machine to the best of my ability, replaced the balls, and still have this symptom a day or two after wiping down. Most of my pins have this issue, but not all and I can't figure out why it seems worse on some machines than others. It is particularly noticeable in my TSPP due to the bright playfield but it shows up in other games too. Worse, over time, I've noticed in my older machines that after a few decades the ball trails seem to get ground into the paint and become permanent. Are there any tricks to avoiding this?