Great idea!! I also own a black pony who had been "naked" all Winter, so had a good layer or two of dirt... bit the bullet last week and he had his first bath since Feb... boy was he dirty. He has finished dropping his winter coat now, so is a bit easier to keep "clean". Will try a coat spray too. :-)
We've found that getting dust off my daughter's black horse we use a very soft bristled finishing brush that just flicks the dust off and makes her coat shine.
I don't like the idea of using showsheen on such a regular basis. I wonder what longterm affects this has.
I too wonder what lasting effects continuous use has on the hide??? I know it works, I have seen it but there's always that 'but'. Plus, at below freezing temps, I am not going to get our horses any wetter than the snow already has.
I highly suggest Ecolicious products, as they are all natural and I do not worry a bit about applying it everyday to my horse, since there are no chemicals in it! It works very well too, not only making them shine but it conditions the coat for a healthy look. They have a website.