Silicone Grease on Polyurethane
Okay, this is one of the biggest pain in the butt applications I've ever had to clean. Up until now I hadn't found any cleaner that could do it without damaging what the silicone grease was on. Polyurethane bushings need to be pre-greased before assembly with a special silicone based grease that is both sticky and hard to remove. The problem has been once I've gotten it on a painted surface (such as the mounting point on a car body, bracket or the part the bushing is installed in itself), the only solution I had was to try to rub off as much as possible with a dry rag and put up with the sticky film that attracts all kinds of dirt and dust (if I didn't want to damage the paint, plastic, rubber, polyurethane, or whatever other soft surface it was attached to).
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