Near the frog and some on the tip, my bow is truning black. What is this and is there a way to get rid of this? Should I just but new hair?

That "icky" stuff is simply oil and dirt. Loosen your bow hair and rub the dirty spots with alcohol, using a clean cloth or cotton balls. Allow the bow hair to completely dry--2 or more hours. Once dry, tighten the bow and rosin well