I don't see the valves being an issue if the bike ran when you parked it. I think alot of rides jump into valve adjustments to soon. Heck I've got 48000kms on mine and still haven't had to adjust them from factory, but then maybe I'm lucky.
Anyhoo back to the task at hand. The canned air should be sufficient, just blow the crap out of every hole you find.
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