There are a lot of how-to articles surfacing online that recommend the use of vinegar on hardwood flooring. As I've said earlier in this article, the consensus is mixed. Companies like Bona discourage the use of vinegar as, according to them, vinegar can damage the protective coating because it is acidic. Others caution against using too much. Just in case you're using vinegar, test it on an obscure area first to see if it damages the protective coating before proceeding to clean the whole area.