[Zeke]

Original finish was shellac and paste wax.

You may have gotten them too wet when cleaning, but it they are sealed, the boards hopefully didn't cup. You could use some steel wool dry and vacuum thoroughly. 2 coats of wax 24 hrs. apart should bring them back nicely.

If the floors have any wax residue, putting any finish on will be dicey. As I said, shellac was the preferred sealer in days of old. Polyurethane will look bad on anything but a freshly sanded floor.