Here's the other thing although it more highly prone with CD's rather than DVD's. It's not the shiny part you have to be extremely careful with as you can always have the shiny side resurfaced to eliminate the scratches. It's the painted side. If you get deep scratches on the painted surface and you're able to see the shiny part underneath, the laser might be able to "see though" the CD/DVD, and it won't play at all. I try to be just as careful with both sides just to be safe.
By the way, what "gunk" was on the DVD? All I can suggest is take it back, and if it happens again, then take the player and have it professionally cleaned.
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The gorier, the better. ;)
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