Don t use a metal brush as it will scratch the tile.
How to grout ceramic tile floors.
Apply the grout apply the grout with a rubber grout float filling the joints over a 5 to 10 square foot area.
Spread the material in sweeping arcs pressing it into the joints to fill them completely.
To grout a tile floor start in the farthest corner of the room scoop some grout on the floor with a trowel and use a grout float to spread the grout over a small joint.
Let the grout air dry then put on a silicone based grout sealer to resist future stains and dirt.
Wait for the vinegar solution to stop bubbling and then scrub the grout with a scrub brush or toothbrush.
Put the mixture in a spray bottle and spray the grout in between your floor tiles.
Pour a quart to half gallon of grout on the tiles.
Apply it to the stain let it sit overnight and then scrub with a nylon brush.
Grouting may seem scary but it doesn t need to be.
Use a hard edged rubber grout float and hold it at a 45 degree angle.
Do not cover the entire float with grout.
Once the grout is clean mop the tiles with water to get rid of any leftover vinegar solution.
You should wait another 3 hours before going over the tiles once more.
For stubborn grout stains mix a paste of baking soda and water.
Begin by scooping up a load of grout onto the grout float using one end of the float.
Use this method for both pre mixed and powdered grout.