Here's a problem that's been bugging me for years: The glass portlights on our Morgan are full of water spots (mineral deposits) that are virtually IMPOSSIBLE to remove (CLR, rubbing compound, etc.)! Years ago, I found some spot remover stuff in the local supermarket that simply dissolved the mineral with no rubbing required at all. Any of you folks have any ideas on what that stuff might be???JimOcean Gate, NJ