Well, Zeborah, I don't know if you ARE AintitCoolNews's Massawyrm, but if not, so did he.
For those who missed the review, Massawyrm commented that during his first 4E playtest, one of his players, who he labeled as his "game designer buddy who got us into the playtest," tried a particular stunt: his rogue ran forward and attempted to kick over a table that two of the bad guys were standing on (sound familiar?) Then said player/designer (let's call him "A.M.") turned to Massawyrm and said "so...how will you handle THAT, DM?" Massawyrm's response: "Hmm, Strength Check vs. their Reflex Defenses." At that, A.M. smiled, because that is, of course, exactly how the game suggests doing it.
For something like the salt in the eyes trick, it sounds to me like a "dirty trick" move. To me, that's more "Wisdom Check vs. their Reflex Defense," since Wisdom seems to me like the relevant attribute for attacks that rely more on cunning and treachery than anything else (like throwing stuff in your opponent's face). But since it's a thrown object, I can see the argument that it ought to be based on Dex. But the point is that there is clearly a default, always on system, for how to resolve attacks of any kind. Mike Mearls certainly hinted as much in the thread about the Bugbear Strangler, and between Massawyrm and Mouseferatu, it's been totally confirmed that said system is in the DMG, even to the point of suggesting roughly how it works mechanically. That's cool.
I imagine that helping DMs decide which attribute to use is discussed at greater length in the DMG. I could be wrong, but I doubt it.