Mix half mouthwash and half baby oil in a spray bottle to get rid of itchy dry docks. Just spray it on - but make sure its not worms first.
Apple cider vinegar works great for treating and preventing thrush, just spray it on the hoof. I know some people that bath their horses in apple cider vinegar and they say it leaves them soft and shiny -you can also just spray it straight onto their coat which will make them soft, but wont clean. It also works well to spray onto manes and tales as a mild conditioner.
Vaseline helps with dried / cracked hooves, I just apply it to the horse's heel bulb once a week in summer, just started that.
My personal favorite... go out and buy cheap human hair conditioner and apple cider vinegar (so many uses for ACV!) . Mix half hair conditioner, 1/4 apple cider vinegar and 1/4 water in a spray bottle. I use this on a regular basis on my horses manes and tails and it is amazing! Just spray it on and work it into the mane or tail with your fingers, works fantastic as a conditioner. You can also use it on their coat, but I wouldn't use it to often because of the human conditioners, I would worry it would dry out their skin.
“Good things come to those who wait… greater things come to those who get off their ass and do anything to make it happen.” - Unknown