Bona"s Hardwood Refill Cartridge combines Bona"s premium, no-residue hardwood cleaner in a ready-to-use cartridge for the Hardwood Floor Spray Mop. It is safe for wood, leaves no dulling residue, and is quick and easy to use. For use with the Bona Hardwood Floor Spray Mop. It is non-toxic and GREENGUARD Certified.