You can soak them in SEAFOAM for about 20 minutes and see how much comes off. DO NOT use carb dip as it will eat the plastic. I personally use EVINRUDE engine tuner in the ultrasonic dip tank.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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