What's the best way to remove old paint from patio concrete?

Carol
by Carol
We have a front porch that was already painted but we wanted to refresh the color so we painted another color on top of it. Because we didn't prep it correctly the new color is scraping off and looks terrible, especially since it's the main entrance porch to our home! It's been suggested we hire someone to grind down to the main concrete but it's very expensive. Any DIY ideas?

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