Aww!! that marble pattern is so precious!
*oogles*
Uh.. sorry back to topic. Anyhow I've never came across a spray that does that. But there is such thing out there called the 'bluing shampoo' which a lot of pet show fancier use before going for shows.
It works in the same manner on how people bleach their hair from black to blonde. and also contains the bluing agent that counteract the yellowish pigments that give that dull look to make it shine. (also used by blonde people the same way)
So don't use it often as it really does contain some quite harsh chemicals. Even show fanciers do it the night before the show.
But the issue here is your furkid is not all white. so I wouldn't know what will happen to the other colors, but the white will be white. hehe.
Also some things to note - things like kitty litter are coat staining, saliva as well if your cat if a constant groomer - because it oxidizes the fur. Another tip to keep your fur nice and silky is omega 3 oil. Can ask you vet to recommend.
Hope this helps!