I would think a dry Teflon lube would not hurt, but I'll recommend what we found to be the best cable lube on Harleys, Dri-Slide. It is a graphite-moly lube that goes on wet and dries, leaving the powdered lubricant. Nothing there to attract dust or dirt! Worked wonders on sticky, recalcitrant Harley clutch and throttle cables, and they get a lot more action than our derailleur cables. This stuff can be found at most H-D dealerships under the name of Bike-Aid. Oh, Harley cables are lined, but that doesn't stop them from getting "sticky" every now and then.