So someone at my flight school decided to clean one of the planes and decided to throw some water over the engine to 'clean' it. idk if that is a good idea or not but today another instructor took the plane and during the engine runup, the engine sounded rough. Also one magneto was fine but the other one had the engine running even more rough. How bad of a problem is this? Does this mean that water has messed up one of the magnetos? Or will the problem go with time as the water dries away?