Now that we have a number of projectors in the building, I have actually started to pay attention to maintenance. We have no current issue, but I foresee a day when I need to clean a lens. Most likely from dust accumulation than from anything else.
We have a number of projectors here and they all says something a bit different but it boils down to.
Lens cleaning paper
Dry soft cloth (for camera lenses)
Has anyone used anything else and had good luck, where does one get deionized air?