The key to successful sealing is a proper surface preparation. Sealer can stainproof and waterproof tiles (or grout) for 15 years or several weeks... That depends on quality of cleaning. We do not clean. We extract the dirt from a substrate's body.
Deep dirt extraction is the most vital task in restoration process. It is also a task that cannot be performed by an amateur without proper machinery and knowledge. The Extractor means- we do a trick that nobody can even imitate.