Just some tips to make life easier, share your own :)
For a really glamourous show tail, spray a little Mr. Sheen through it. Helps separate the hairs and really makes it glisten.
Round nylon mesh body scrubbers available at chemists and supermarkets (the kind sold with liquid soap) are great for washing horses. You can suds up using less shampoo and they easily remove stains. Best of all, they are really cheap. Ordinary tomato sauce does a great job of cleaning copper bits. Rub on with a clean rag, then rinse. Not only does it make copper shine like new, it's non-toxic.
Keep an old strainer near your horse's water trough. It's handy for scooping any leaves or twigs that may have fallen in.
For an effective and natural fly repellent, use 20 drops of citronella in 500mls of water. Shake well and spray on your horse.
If you have a chestnut horse, feeding him pumpkin can really improve coat colour. Chop up a piece of pumpkin including skin and seeds and microwave around 8-0 minutes, until it is soft. Mix in with feed.
If you have trouble removing your horse's chestnuts, smear them with Vaseline every day for four or five days and they will peel right off. For itchy tails, mix equal parts of Listerine (original formula) and baby oil in a spray bottle. Spray on and comb through to the roots with your fingers. This really works and seems to get rid of dandruff too.
To make silver parts of your saddlery really sparkle, rub over with a pencil eraser and buff off with a clean cloth.
Try using shaving cream on your leather to make it really supple. It's what a lot of baseballers use on their catching mitts. Be sure to use the foaming type of shaving cream and NOT the gel!
Wrap some stickytape around your hand with the sticky side facing outwards to remove hairs from your riding coat and saddleblankets.
For really stained white tails, spray through some Preen pre-wash stain remover and leave to penetrate for around 15 minutes, then shampoo and condition as normal.