The way this is advertised it sounds like it comes with a grout brush to clean grout, however the brush is actually a multi purpose brush and its so soft it does not clean anything stuck to the floor.  I bought this for my sister and tried it out for her on her own floor.  She had juice spilled on the floor by her grand daughter that was a day old.  This machine would not clean it even after going over it repeatedly.  There is no way it will clean the grout.  I told her to scrub the floor really well then use the machine daily to keep it up.  Today she tells me after using it for less than 2 weeks that it will no longer suck up the water.  I feel really bad because she wanted a Bissel and I told her this machine was way better.   If it wasnt for the price I would have returned it but its just not worth the hassle. 
I'm very disappointed with this purchase.