[Zeke]

Depending on your take on the environment and any nearby landscaping, I use lacquer thinner, a tooth brush and a hose with a high preeure stream. If there are big areas to do, you could cover it up after wetting with water and then floating the thinner on the water (it actually combines for the most part). Then hit with the pressure. Paint remover works too, but you might see some staining. Best to check in a small area.

Lastly, new and old concrete can be sanded and the results are very pleasing. It's a whole new look and it's fairly elegant. This whole sanding process came about when they started using fiberglass strands in the concrete mix as an option for addtional strength. the fibers woulb be sticking up all over the place, so they sanded them off and came up with this ultra smooth look. It's nto too slippery either. If you have exposed agregate, back to the begining.