It is possible that lead and tin can react with the potassium hydroxide in spilled electrolyte to form lead and tin hydroxide. If there's just a small amount of spill, it may form lead and tin oxide as well, or instead, or with a reaction with the air afterward, as the chemistry of lead and tin is a little bit more complex than for other metals. At any rate, yes, the corroded solder traces can be a problem for solder adhesion when trying to repair. Try to scrape, as carefully as possible, the oxide off. Try to use swabs of vinegar, or other acid cleaning agents designed for solder joint cleaning, like an acid flux, to get the breaks clean before re-soldering. You appear to be looking for some sort of reagent to dunk the board in and get 100% dexodized solder traces with 0% damage to good solder and other components. You will not succeed in that search.