If the ReadyClean® leaks down the side of the machine or near the solution tank, check to make sure the rubber gasket is correctly placed on the cap of the solution. The solution tank may not leak when lifted out of the machine; if the rubber gasket is placed incorrectly, it can cause leaking when the tank is set back into place.
If the ReadyClean® leaks at the spray bar, make sure the handle is installed properly. Try removing the handle and reinstalling it. Check that the screw for the handle is aligned properly and goes straight into the back of the cleaner.