...I think it is safe to use the lighter fluid as long as the movement isn't soaked in it/bath and, as you point out, dont soak the coil. I haven't tried lighter fluid yet - I use the CRC Electronic Cleaner. It works great, and in a similar manner as the lighter fluid ( I think... ). It evaporates fairly quicly and leaves no residues. It's not expencive either - I have had a $10, 200ml aerosol for over a year now and there's still about a 1/4 left ( I even use it on the mech. movements as a final "rinse" before oiling the movement ).