Is there any way to get rid of the yellowing that occurs from polishing?
Thanks!

Get a 4 sided buffer and gently buff your nails. It will help alot. Darker polishes do stain, so make sure to use a non yellowing base coat before polishing with a dark color. I have also heard people use lemon juice to bleach them by digging your nails into lemon halves for a few minutes then rinising.

after removing soak your hands in a mild clorox solution. Always wear a good base clear coat. I use Sally's its the best I've found. It might take a few times of soaking to rid of them and you might not totally rid them of the tint. Like the above said, buff your nails, seal them and it helps tremendously with those dark colors. I am a burgundy kinda girl, and I can tell you from experience, its harder to remove the tints than put them on.