We recommend you use the branded Hoover cleaning solution for hard floor for your Hoover FloorMate as it is fully compatible with the device and able to remove all possible dirt types on sealed floors. Using branded cleaning solutions with cleaning devices usually prolongs the lifespan of a vacuum cleaner or a carpet washer. However, if you are out of stocks, you can also use a mix of soapy water and up to 2 tablespoons of baby shampoo. Experts do not recommend DIY homemade cleaning solutions, as you risk clogging the FloorMate's tank.