Cant hep you with that, but do be careful how you clean this space. Post construction dust can be quite harmful for you when you breathe it in. When I was a real newbie I took on a post construction job - a new house. What I did NOT know was that the workers were still there, grinding down the cement for a new tile floor! OMG the dust was simply unbelievable, and I wish I had just walked off the job and said good riddance. It wasnt safe for me, and it wasnt even a good way to CLEAN this house. The owner is a physician, and he should have known better, but then, I am an RN and I should have! Never again will I attempt a job like that. I dont think there is a safe way to mask up to avoid breathing in that sort of stuff, and I dont carry masks anyway. Be careful! And good luck - someone will be able to help you with pricing.