Baked textures effected by main color

I'm loading in a max file that has had its textures baked in already. When imported into Unity all the materials are colorized by whatever color shows up on the "main color" slot of the Unity Material. I can only fix this by changing the main color slot to white. This is very time consuming with multiple materials. Is there any way to change the main color of all my materials at once? Better yet, how to avoid this in the first place. Any help or insight would be very much appreciated. Thanks!