Are you sure the dirt is on the inside? I detail headlights at used car dealerships and sell a product called Crystalenz to clean gauge panel plastic. Crystalenz is made for cleaning headlight lenses but it works really well on gauges.
You'll need to remove the instrument cluster. First, remove the radio/climate control panel and the lower dash panel. Then you need to pry out the headlight switch, undo some screws that hold the upper dash trim panel, and remove it. This will give access to the four screws that hold the cluster in. Carefully reach behind and undo the two plugs into the rear of the cluster. Remove the cluster and put it down carefully on a clean towel. The bulbs are mounted in twist-to-remove sockets which you can only access from the back of the cluster.
check the instrument cluster connection in back .. i got one and they would work sometimes then shut off .. i hit the dash cluster and they came on .. hense a bad connection at back plug on instrument cluster .. it runs through the plug at back of instrument cluster. sometimes the connection gets dirty doesnt make good contact. clean them up . fix is to take the instrument cluster out and clean up the connections in back.
The potentiometer is one of the two pegs that stick through the clear plastic on your instrument cluster. If twisting the peg doesn't bring the lights on, then remove the instrument cluster from the dash and take the potentiometer off. You can either replace it, or try to open it and clean the contact points (I've done this on many occasions).
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