Mr. Clown, I have no experience specifically with the '70 grill but spent lot's of time cleaning autos and have found that the detailing sprays like Eagle One Wipe & Shine do an excellent job of cleaning, removing old wax & leaving a great looking finish but on anything with corners & crevices it will take quite a bit of good old fashioned elbow grease to get the job done. Use a soft bristle tooth brush & soft cloth to wipe.
