Water stains on unprotected floor

Q: I have just moved into a house which is 55 years old. I have oak floors which have been sanded down but no protective coating on them. A large plant that I have has now left water stains on the oak and I am wondering how to remove the water stains.

What do you suggest?

A: It is quite likely the damaged boards will have to be replaced. I would suggest you have someone prepare this floor and apply several polyurethane coatings to it soon.