You will need to buy the cleaning fluid and use it as directed. Don't skimp on the cleaning as this is the most important part of the process. It's all on the instructions on the can or even the web site.
Yes I'm a fan of this stuff too. I've done my whole bathroom tile area with it. The secret is in the pre cleaning and the correct application of the two coats. You have to follow the directions to the letter. It's a multi problem solver.
