I too correct an unexpected wing drop with rudder as this is how I have been taught.I have always been taught that opposite rudder and neutral aileron is the way to avoid a spin as this prevents the dropping wing from stalling further.I am not saying that this is correct,but we can only follow what we have been taught so I would be really grateful if you could explain the reasoning behind correcting it with aileron as I am always interested in learning how to make my flying safer.
Thanks,
El Cid