Old 01-07-18, 08:31 PM
  #10  
bargainguy
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I like CRC PowerLube in the red can (has PTFE), works for both solvent flush and lubricant. Spray into the innards, let it drain, work the shifter in both directions, repeat. This might take awhile, don't get discouraged, as the lubricant Shimano originally used gums up over time and doesn't get freed immediately.

I find this easiest to do while mounted on the bars with cables under tension to both derailleurs. I like to leave the bar tape off, but if you have tape, cover it with a rag or a plastic bag because the lubricant will drip. What typically happens is at first, they don't shift at all, then you'll get one upshift and one downshift, then a few upshifts and downshifts, then the entire range. Be patient and keep working at it, it'll come back.
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