I am unhappy with the color and grout on my brick fireplace. I see certain brick fireplaces that have a white wash look with the color of the brick still very present . I really love this look. Is this something I can replicate with a product that is on the market? Do I have to remove the grout/mortar in the existing fireplace. Not sure where to start with this. Can you help?

Why not experiment with whitewash.

You can mix glaze with paint, white, cream any color paint you like and use that on the fireplace. Use a rag to take off as much as you like and that will still let the brick show through. Easy to do.