For applying Hoof oil / Hoof flex on your horses hooves, you'll find a small sponge works just as well as an oil brush.
Having trouble keeping your stainless steel horse bits and stirrups clean and shiny? You can soak any stainless tack item in a bowl of vinegar for several days to dissolve the rust. Rinse thoroughly after using.
Do your horses Manes and Tails get tangled? Try rubbing them with some vegetable oil to help loosen tangles. Better than expensive detanglers.