Even if not looking at it that way - He Twilight's companion, that justifies this - but helping someone else bathe would be highly unusual without a damned good reason. Now that I think about it, it seems like something he'd try to do when he was being overbearingly helpful (and I use that term very loosely) after AJ saved his life.
Considering that the only difference between this and how we normally see them is the addition of soap and water, some people are really desperate to find something that isn't there. not the first time.
Never tried the shampoo (hmm, X-mas gift for nieces? lol) but the 'hoofmaker' hand & nail therapy is good for dry skin. I think there is other stuff too.
It is a horse and people shampoo & conditioner brand! It's sold in most pharmacies in the US, because it works fine for human hair as well as horses. (it actually has instructions for both on the bottle)