Thanks for all the replies. I think Kayty makes a good point, about the humidity. I think that may be the tipping point as to whether you should scrape or not scrape. Of course, down here in SoFla (and I know many other parts of the country) the humidity is just awful. I call it "soupy"." I can feel the moisture in the air.
I have been doing what nahareiner said...I just do under the neck, chest and under the belly with the hose. I do have a fan on in one of the stalls, but they seem to prefer standing under a shady tree in their paddock rather than to go in the stall and stand, which drives me nuts because it is WAY cooler in the stall.
Anyway, thanks again!