As a contractor we never leave a slab trowel finished. It's a slip accident waiting to happen. We always finish with a horse hair broom which leaves a little texture. As far as cleaning, you could acid wash it but it will open the surface even more than it is. That would need to be done anyways if your going to use epoxy (best choice if you are a clean freak like myself. I don't even like chips or sand, but I'm in AZ so we don't have that much rain to make it slippery.). I would never use paint. it won't hold up. You might want to just invest in a floor machine and scrub it once in a while. That will also end up polishing your floor over time. You can even get waxes made for concrete.
"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery."
Winston Churchill
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