The appropriate homemade cleaning solution for porcelain tile depends on several factors, including if the tile is glazed or unglazed and the material to remove, but often, plain water or a gallon of water mixed with 1/4 cup of white vinegar is all that is required. Sweep or vacuum the tile prior to applying cleaning solution so that cleaning does not force dirt into the grout. Avoid brightly colored cleaning materials that can stain the tile.
Glazed porcelain tile is almost impervious to water, although its grout is porous. This makes it an easily cleaned surface. A damp cloth or mop removes most materials. Adding vinegar helps loosen stuck-on dirt and grime.
In the bathroom shower, moisture allows mold and mildew to grow on the tile. Remove these stains with a solution of 1/4 cup of bleach and 3/4 cup of baking soda. The resulting solution should be thick enough for application with a toothbrush. After scrubbing the stain, leave the solution in place for about 10 minutes to bleach away any remnants before rinsing the tile. Keep the bathroom vent fan on when using this solution.
For unglazed tiles, a mixture of 1/2 cup of baking soda and 5 drops of grease-cutting dishwashing liquid in a gallon of warm water is effective at removing grease. Avoid using abrasive materials on any type of tile to prevent scratches.