A grout rake and an oscillating multitool are good tools for removing grout, according to PopularMechanics. The rake is a hand-held tool recommended for small areas and narrow grout joints measuring 1/4-inch or less. The multitool works best on surfaces larger than 30 square feet and with wider grout joints.
The rake has a handle on one end and a steel blade on the other. A super-sharp carbide grit coats the blade. It is pulled along the tile joints to rake out the grout joining them.
The electric-powered multitool oscillates at high speeds instead of spinning. This makes the tool easy to handle and control. It is lightweight and has a firm grip. Its blade is also covered in carbide grit for grout removal.