How to soak the bottom of her tail?

I have been trying to get my Haflinger's tail white again after she managed to stain it yellow. I tried EVERYTHING then it finally hit me. What do I use to get my white show clothes clean when they are covered in dust, dirt, manure, and pretty much anything you can find at a goat show? I soak them in Borax for a few hours(or overnight depending on how bad they are). I want to try this on my mares tail. Only question. How?? Her tail isn't long enough to put it in a bucket to soak(unless I get a tall bucket and fill it all the way), and I know she wouldn't stand still for the time to let it soak. Any ideas?

Don't soak.

Lather with a bluing shampoo, let sit for a bit, rinse, repeat.

Try again in a couple of days.

Actually the borax might work, as would some oxi-clean.

Just spray on whatever (oxi-clean or borax, both can be dissolved in water and then put into a spray bottle), braid the tail and put it into a tail bag. Leave for a bit and then wash it out. I do this a lot to deep condition my horse's tail, but with conditioner, obviously. You might also want to condition it after, and apply a silicone based detangler (like Show Sheen) as it will keep the hair less prone to breakage and staining.

Good luck! Just be careful not to get any oxi clean or borax on her dock.

I suggest buying a whitning shampoo get her tail wet and leave it in. So it doesnt happen again I suggest a tail wrap so that she can't get it dirty.

Mrs. White's Bluing. In laundry section, usually on top shelf or in middle?

Wash tail, rinse well, and then dip tail in bucket, and use cup to pour it over rest of feathers and dock. Rinse.

Or White Mink or Minx??? But in hair coloring section of store, top shelf usually, gray bottles and used to have pink tops. Use one for silver/white hair, follow directions. Takes out yellowing.