If you use a hand pump to fill differentals and transfer case,
what do you clean the hand pump with after use?
Would not want to contaminate anything when I use it for the next time!
Use brake clean. Thinner or mineral spirits will kill the plastic...
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I usually don't worry about it. Before I pump any fluid in, I always have to pump the old fluid out. Pumping the old out first removes any different kind of fluid that may be remaining inside the pump.