Re: Cleaning 100+ year old hard wood floors
I clean my kitchen floor with straight white vinegar n a small sponge, and wipe dry with a piece of old linen (microfiber works, too). It was recommended for the waterlox finish I put down. It does not leave any streaks and seems to do pretty well. I have 6 years practice cleaning it. If you need to use a detergent on some oily messes, then do that first, and then do the vinegar as above.
Remove not the ancient landmark, which your fathers have set.