RPM is a heavier duty product and would also work, however their recommended application method is to apply it to a heated/warmed part (160 degrees F or so) and I don't like to apply heat to delicate dipped or plated parts. The Ammo is a thinner product and wiping away remaining residue in small recesses on complex shaped parts (like and alternator case) is easier, Q-tips are handy in this job.