I do about an hour or so of high-intensity cardio each day, usually on an arch trainer or elliptical, depending on what's available. I find that I sweat a lot. The workout itself doesn't feel amazingly strenuous to me but I usually soak all my clothes, and additionally I generally soak through at least two gym towels (not the full-sized ones, but maybe 16" x 25" face towels) in every workout.
Usually I find it mildly annoying to have sweat all over my body, so I wipe it off with the towels - which is why I soak two of them every day - but I'm wondering if, on balance, this is doing more harm than good. When I'm running outside I usually don't bring a towel and I just assume that the sweat is performing its function and cooling me down, but the gym I go to doesn't have any fans pointed directly at me, and the arch trainer's built-in fan is pathetic and barely noticeable.
Am I basically causing myself more trouble by wiping off my sweat? Does the sweat I wipe off just get immediately replaced anyway? Could this be hurting my workout?
Note: I usually drink 1L of Powerade Zero during my workout, which seems to replace my electrolytes OK. Years ago I used to just drink water and I'd feel ill after 1-2 hours of cardio, but since switching to Powerade that's not a problem.