I use a bug sponge, warm water, and a good car wash soap. The bug sponge is rough and it works extremely well without scratching the finish. My Stillen tips do show some blackness and this technique works well for me. I also don't leave them very long between cleanings (a good practice).
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Andrew
2009 370Z Sport/Touring 6MT sold
2013 Honda Civic Si coupe D/D
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