Concentrated solution adds value; 1 bottle concentrate = 7 refills Non-Streak Formula with No Dulling Residue Shark's Wood & Hard Floor Cleaner is designed exclusively for use with the Sonic Duo This Wood & Hard Floor Cleaner outperforms the competition and never leaves behind a dulling residue or streaky finish Shark's Wood & Hard Floor Cleaner is designed exclusively for use with the Sonic Duo. It is a concentrated formula that provides consumers with a better clean, while leaving floors looking and feeling cleaner versus the competition. This Wood & Hard Floor Cleaner outperforms the competition and never leaves behind a dulling residue or streaky finish. The concentrated solution and washable cleaning pads offer better value versus alternative solutions and disposable pads. Plus, the concentrated solution and reusable bottle add increased convenience and enhanced ease of use over alternative concentrates. The 100% non-toxic solution is safe for use around your family and pets.