This seems to be a common concern. When I had my car serviced at the factory, I remember Mark Baldwin showing me the severely corroded plugs which had to be replaced when only a couple of years old. I now ensure that the engine is covered when washing the car and also make sure the plugs are removed and checked at least annually.
This could be an opportunity for someone with good metal bending skills to come up with a solution. I would certainly be interested.
