How do you keep a palomino mare's tail clean

I own a 7 year old palomino mare who's tail is always a mess. She never picks her tail high enough when she goes, so she gets chunky grossness in it. It gets even worse when she comes in season. Her tail is pretty much stained black. Over the summer we wash and condition it about once a week, which helps but doesn't get out the stains. We've tried blueing without much success. Have any of you found anything that gets the black out of light colored tails?
Here's a picture (on a fairly good day)

Have you ever looked into why she doesn't pick her tail up properly? That's very unusual. Perhaps a visit from a chiropractor would set her right.

As for the color, if blue or purple shampoo isn't getting the stain out, I don't really know what to tell you...

...you could dye it all the way black! LOL

Haha, I always say we should just dye her legs, mane and tail black so she could be a buckskin :) she's always made a mess though. She has an extremely thick and heavy tail, and her tail bone I also very long. She lifts her tails, but so much of it hangs down it gets dirty. She also has cronic runny stool (she doesn't have ulcers and we've been fleeting different supplements to help her) which definitely doesn't help. We used to keep it braided, which kept if cleaner, but damaged her tail so now I just braid it for shows.
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I have the same question we just purchased a Palomino mare and she has the tail from hail. If you know what I mean. Her tail touches the ground and is so thick that we braid it into four normal sized horse tail braids. On top of that it is curly and it turns into dreadlocks. I don't think it has ever been washed either it is just gross.

I would try putting it into a tail bag...they make nylon ones that are more like plastic than the regular sleazy fabric ones, that might help a little. My palomino has the same problem, its disgusting! Hope this helps

Do you use a specific tail bag that actually stays? I've tried vet wrapping the top so she can lift her tail easier, which helps- for about a day until she rips it off. I think it would take her about 15 minutes to figure out how to get a tail bag out.

My palomino's tail gets gross too and never seems to stay clean, but I'm glad it's not that bad. If you find any kind of cleaner that works let me know :)

I was ezAll Total Body wash on my palomino gelding. I pour a little of the concentrate directly on the mane/tail and work it in. Let it set for about 5 minutes and rinse thoroughly. For me,this stuff is amazing how well it removes dirt & grime. Then if needed, I use a whitening shampoo, let it set for a few minutes also and rinse. Last, I use a good conditioner. His mane and tail come out sparkling white. In the springtime, it may take 2 washes to get the winter gunk out of his tail.

I've never used a tail bag, so I'm no help there.

What kind of whitening shampoo did you use? I didn't even know there was such a thing, haha

Dara- Thanks! I'll have to look into that brand. Usually I do about the same process, however I just do one wash a week because it gets gross ands tays gross year round.
Amp- There's a bunch. Its pretty much any blue/purple colored shampoo. I'll check this weekend when we trailer (Our shampoo is in our trailer right now...long story) what brand I use.