Chalk is always and interesting thing to try to clean as it imbeds itself deep withing the fibers due to how small its particles are. The first thing I would suggest you do is take your own vacuum and and see how much you can get out. I we immediately come in and hit it with water without you extracting as many of the dry particles as you can the colors can bleed out and make a huge problem area for you. Unfortunately we can not guarantee this service will work, but it really is your first step before deciding what you have to do. As always if you have any questions be sure to give us a call 877-9055!