Removing black marks from oak floors

[Ed Falis]

Refinishing, and have a number of black areas from either animals or water. Any suggestions for removal?

Thanks,

- Ed

[Jim Becker]

Oxalic acid is sometimes used for stain removal, but it may also bleach around the stain, too, unless great care is taken.

[Ed Falis]

Thanks, Jim.

[Phil Phelps]

... and the pros replace the boards.

[Ed Falis]

Thanks, Phil.