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  1.  
    i dont think dirt on the lens should really make much difference unless it is totally obscured
    the beam is almost the full width of the lens as it goes through it so any particles in the way will have miniml effect
    just like the systm is rather immumne to dirt on the disk itself it is even more so at the lens

    dust inside the optics is however another matter as some of the optics are in a focal plane and there even a tiny speck of dst can screw up everyythng

    ive always thoght of thos dvd lens cleaners as a bit of a woo thing
    i wonder if anyone has actually tested any of them scientifically