mix 50% acid, 50% water in a watering can (large). Add acid to water not water to acid. Keep your head away from the top of the watering can. Pour this mixture on the effected concrete and if necessary, use a stiff bristle broom to work the acid/water mixture into the concrete. Wait 5 min. and hose off the area. If needed, increase the acid to water water ratio and repeat the above steps. Always try this before using straight acid.
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I would recommend using a concrete stain as opposed to any kind of "concrete paint". Follow manufacturers instructions and ensure concrete is totally clean before you begin.
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