Bruce, I am sorry not to have the time to reply, however, if you care to call my office I will give you a quick run-down on "one man's look" on cleaning options. Rarely a day goes by in which I don't read something, see a project or talk about cleaning techniques and philosphies. By the way, Ken (Apple) performed over 42 cleaning mock-ups for the building you referred to. Additionally there are quite a few experienced applicators on BP, Mark and Michael D. to name a couple. Best, Leland Leland R S Torrence Leland Torrence Enterprises Management, Restoration and Conservation 203-397-8505 Fax: 203-389-7516