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I've used EDTA with good luck, when my parents got an electric push lawn mower the battery was junk so we put EDTA in it and charged it a few times then used it for the rest of the summer, I've also had really good luck with battery desulphater chargers, on the same mower, the best tho is the little battery desulphater box that connects right to the lead acid battery as it apparently does a pulsed charge discharge on the battery, to keep the plates active and clean, I have a device like this on my electric car battery pack and my parents have one on their batteries for the PV panels.
I've also been told that you need to bring a lead acid battery up to full charge and hold it there for 12 hours or so, so basically leaving a trickle charger or smart charger on the battery over night, I've done this with my Civic's battery (4 years old) when I thought it was on it's last leg after leaving my lights on a few times -20F weather and the battery is still strong.
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