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I have had extremely good experiences with PLASTX (Maguiars); however, I removed the plastic entirely from the instrument cluster (I restore them, so it isn't a big deal for me). Once removed and the light shields removed, I clean them spotlessly, and using a microfiber or new finishing cloth, and with a towel underneath, I rub hard with the Plastx on a hard table. The plastic actually gets warm, so it must be abrasive to some extent. I've been able to take most instrument plastic to "as new" condition this way. Other more serious scratches I get out with a buffing wheel and industrial polish first before the Plastx. Plastx It works very well on modern headlights, also.
Once you have the plastic perfect, the worst enemy is keeping dust (or dog fur in my house) out of the cluster during reassembly.
From what I know about how this works, you actually melt the plastic (on a molecular level) back into itself, and this is what really gives it the like-new appearance. You can't get that kind of pressure/heat while the plastic is in the panel, much less, in the car.
Because the bottle I have could probably do 10,000 instrument panels, I found another interesting use for this stuff; I've performed miracles on people's scratched-up CD's and DVD's with it! Although I've refused payment as best I could, the bottle has already paid for itself 3X!!!!
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