Answer by  
                                                                                          workman (32)
                                                            
                          
                          
                                                           replacing grout is pretty tedious. first you must remove all the old grout, do a good job or the finished product will look like crap. you can do this with a paint scrapper (5n1), an old chisel or screwdriver. after that just fill in with new stuff and your done. make sure you vaccum up all the old stuff first.