Dark watermarks from pet urine

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Q: We took carpeting up from our bedroom which has hardwood floors underneath. When cleaning the carpet from pet urine there are severe dark watermarks. Is there a way to lighten the marks before sanding and refinishing?

A: The water marks are likely urine also. Your best bet is to replace the affected boards prior to sanding and finishing.

(Fyi – Lots of experiments to read up on re: urine stains in our Q&A!)

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