Start conservatively and work your way up if you can't get them out.
I pretty sure that a clay bar would work perfectly though. It worked wonders at getting rusty rail dust out of the paint of my brother's white corvette.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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