The elements of tile and grout cleaning vary from job to job. Ceramic and porcelain are both non porous tiles. The tile itself is not often what I'm focused on cleaning but the grout lines. Grout is porous by nature. After installation grout lines are sealed to prevent staining. Our method for cleaning grout lines uses high pressure of up to 900 psi and hot water up to 200o to clean and extract the pours.
It is imperative that after cleaning the grout it is sealed once dried to prevent it holding onto soils and becoming stained over time. Often bad grout lines appear from the degrading of the sealant. Be sure to only use products meant for cleaning tile. When you wash or mop your tile keep in mind to read the proper dilutions of your cleaning products, some products when improperly diluted will cause the grout sealant to break down leading to damaged grout lines.