I am working in small sections. I have tried a variety of scrapers and solutions to loosen the funk, but the only real solution is elbow grease. My arms are aching! I managed to clear about 10 feet in two hours...so it will be a while. I woke this morning with my hands in claw shapes from holding the scraper. Actually I am not even using a scraper at this point. The most effective tools have proven to be an old outlet cover (?) and a lawn edger.
I promise to give you an update and tour when we are done. For now, I leave you with this photo of Lucy in a basket.