I would normally have thought this, as their standard is very high in general for most things. However, I just got back from a week down in Disney World, and I have to say, the pins at the Disney Quest in Downtown Disney are a horrifying mess. Here's some pictures of the play field of their TFLE. Their Avengers was also an LE and was equally dirty, as was their X-Men Pro, which was so dirty you couldn't even tell the Hero Indicators were surrounding a white circle. It was horrifying.

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Thats what blew me away. Could you just have one of the kids who turns them on and off each day pull the glass and wipe the play field center with a rag once a week? Even that would be a massive improvement.