I seriously doubt canned air would have damaged anything on the logic board..fact is that even if a small amount of water reached the board it might have shorted out a secondary but certainly not useless component.
Fact is that due to the size of parts it's hard to see anything with less than 10x magnifying and often one can't see anything at all and just needs to test power/data lines. If it spins full speed and a replacement fan and smc reset didn't help it's likely the fan speed control data line or related component got damaged. I'm afraid you'll need a component level repair professional here.