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I have had very good luck using CRC Power Lube available at Napa Auto Parts on my Shimano STI levers.
I had one 7sp rear lever rebuilt by Jim McVey, and it works great now. All of the others that have become stuck or stopped working I have sprayed into the internals with the CRC Power Lube, and after a day or two they started working again and continue working.
I think the main issue with most of the older Shimano STI levers was the grease/lube they used turned gummy as they aged (combined with making them virtually non-serviceable).
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