I would be careful about using it too much on the seats. It is an abrasive, so it will be hard on the leather. As long as you don't use it often, I don't think you will have too much of a problem.
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1998 Supercharged Riviera - Custom CAI, Alpine spx-13ref, Infinity 6x9's, Alpine 4 Channel Amp, Kicker KX3, Silverstars, STB, Hawk Brake Pads, Monroe Air Shocks, KYB GR2