How To Keep Ophelia Perfectly White?

[Opi-the-furry-conductor]

This is my white moon faced persian Ophelia. She refuses to wake up and pose for the camera at the moment so this is the best I can get.
She's sweet and adorable I love her bunches and I want to groom her properly. I comb her gently and make sure her fur has no tangles. I wash her face with a slight damp cloth. I take very good care of my little cotton ball. However because she has completely white her fur tends to stain a tad.
I don't want her beautiful fur to be nothing but the best brilliant white it can be. I've never had a persian before so I don't know how to keep her fur from staining. Her rear, bottom of her paws, and her face tend to show slight signs of color despite my cleaning. Is there a way to keep her completely white?
Update:
P.s. I live in the Arabian Peninsula so commercial products for cats are extremely hard to come by. So unfortunately I will not be able to get them :/. If you know natural ways or a human pet safe shampoo that would be great.

 

[LTS3]

posiepurrs might have suggestions on keeping the fur white. I'm sure there are speciality shampoos for white show cats so they look their best in the show ring.

I found this TCS thread that might be helpful: Whitening Shampoo?

Info on fur care on the CFA Persian Breed Council web site: :: CFA Persian Breed Council - Grooming White Persians ::

 

[Opi-the-furry-conductor]

posiepurrs might have suggestions on keeping the fur white. I'm sure there are speciality shampoos for white show cats so they look their best in the show ring.

I found this TCS thread that might be helpful: Whitening Shampoo?

Info on fur care on the CFA Persian Breed Council web site: :: CFA Persian Breed Council - Grooming White Persians ::

I forgot to mention a very important factor >.< I live in the Arabian Peninsula so cat commercial shampoos are like an urban legend her lol. Sorry for not mentioning that earlier >.< Thank the site of the breed council helped me a lot.

 

[posiepurrs]

A cat safe whitening/brightening shampoo is what is needed. Would you be able to order on line since you can't buy it in your country? I would recommend Jerob Snowy Blue, following directions on the bottle.