Brake cleaner (I pick the red nonflammable kind) works really well, but isn't good to run in the engine, so clean it all out thoroughly. I collect it into a steel coffee can and reuse it to clean small parts. When it gets gross, turn it in for disposal (my county accepts household hazmat for free). It is carcinogenic so work with plenty of ventilation. The newer green version is highly flammable which worries me more...

Definitely keep it off your paint!

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles