okay, someone had mentioned using a clay bar to get stuff off. But this seems a little heavy duty, because i'd have to clay bar the whole both sides of my car. Should I still clay bar it? Or get some sort of spray?

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Own:
2013 C300 4matic
2009 C300 4matic

Owned:
2001 E320 Sport
1992 500E
1989 300SEL