We just finished mudding our garage and in the process, some of the mud fell on the floor and dried up. When we were all done, we swept most of the dust out of the garage, but to clean the floor good, we took a garden hose and rinsed out the garage. Anyway, we took the taping knive to the concrete ground and scraped up the hardened dried joint compound and now it looks like we have scuffs in the concrete. Why would this happen? Is the concrete not dry after 4 months? Is there anything I can do to fix it? Also, what works best to clean up any remaining joint compound off the floor?
Thanks,
matt