Replace the tube. Sometimes it's not worth getting aggravated at an inexpensive, inanimate object. FWIW, that's why I carry at least two tubes on all my bikes. Fixing roadside flats isn't usually enjoyable under the best of circumstances; trying to find a small hole on the side of the road with 50 mph traffic around me, then abrading the area, waiting for the glue to dry, etc. No thanks. I'd rather replace the tube, get back on my way, then at home I can patch a bunch of tubes at one time - usually on a cold, or windy Saturday afternoon.