freshen up tired original paint 68 barracuda...

RustyRatRod said
I would suggest some type of cleaner compound. Meguiars makes a cleaner wax that works well. Follow that up with a regular polish wax.
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x2 plus
Use the cleaner wax with a 3M foam pad on a low speed buffer. Wash entire car and apply good quality wax or poly sealant.