Can you use human shampoo on a horse's tail & mane?

I don't have any money to buy horse shampoo and no-one at the yard has any but I need to wash my pony's tail (and ideally mane). If I can, would it be better to use Melon scented shampoo which de-tangles (and it's kid's shampoo and conditioner so it'd be gentle) or Apple and Raspberry scented shampoo which makes hair soft and shiny?