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EDTA is the best one I've found, JC Whitney used to sell a good mix that was easier to add to the battery than pure stuff. (which must be dissolved in water first)
Remember though EDTA will only work if the battery is sulphated, if its shorted or damaged it won't do a thing.
Epsom salt again can allow a sulphated battery to accept charge but it also has negative side effects like faster self discharge and faster positive plate wear, I guess it could be worth a try but there are better alternatives that cost about the same. (like edta)
And remember the epsom salt must be dissolved in water before it can do anything.
Cheers
Ryan
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