Let the grout set up for approximately 20 minutes until a film develops over the tile then clean the area as shown in photos 3 and 4.
How to remove old tile grout from walls.
Wipe the excess grout and film off the face of the tile with a damp sponge rinsing it often.
After the grout has dried for a week protect it with a grout sealer.
Clean up with a utility knife.
Vacuum as you go.
Grind the grout at an angle.
Scrape with a screwdriver.
To do this use the grout float again this time holding the tool at an 80 degree angle to skim the excess grout from the face of the tiles.
Required tools for this grout removal project.
Use the scraper to clean off large debris and then clean off any soapy residue with a damp cloth.
Put on safety goggles to protect your eyes.
Attack the grout straight on.