I used to use PO&S but for some reason he had a reaction to it last year so have stopped using it. I'm moving to a yard that is heavy clay so will have to wash his legs - to be fair he's so hairy that his actual legs won't get too wet!
I find blotting my lads feathers with a towel, then combing feathers out helps dry them quicker, before a show I wash his tail, then bag it and it's always still very damp the next morning, next year i will wash his tail sooner so it can be bagged when dry, I'm working on making him leggings to keep him clean before a show, he's a coloured with lots of white
Thermatex wraps will make legs hot, an ideal place for bacteria to breed in a feathered type ...Better to use pig oil before putting out, then hose, towel and stable on wood pellets at night, imo
I used to have to wash and dry shire horses feathers all the time. We used fine sawdust (like you'd use for hamsters). Put a bit in a large tub trug and rub the sawdust over and throughout the feathers, comb out and then run a bit of pig oil through them.