keeping a cream horse cream

I am wondering what ideas anyone had for keeping the color of cream. I see lots of threads on black horses but what do you do for the lighter colored horses? You can't really tell in this picture but she is actually getting spots! I would really like the spots to go away!

Are the spots a dappling due to good nutrition? :)

I had no idea that dappling was because of good nutrition! How does that work? And how would I know if it was? She is definitely getting better pasture and grain now

The gallop shampoos here wash out any stains pretty well.

I use show sheen and mane and tail conditioners and shampoos. I also have some organic mane spray. I forget which company makes it. It repels dust.