Gray Text Box prints out

I created a fillable form and sometimes I am required to print it out and fax it.  When I print it out, the gray boxes print out, they aren't clear like someone mentioned in another forum thread.  I have gone under Preferences>Forms and the box show border hover is unchecked and I changed the fields Highlight color to white but it's still showing this gray.  How do I get these gone? I'm sure it's something simple but I'm using Adobe Acrobat Pro.  Thank you