One who can now state he is 100% clean and has never broken Google guidelines is a lucky guy. I for one cannot say I am the one (are you?).
Who didn’t buy or trade links for “malicious” purposes in the past when Google wasn’t that smart and strict? And now what we have is probably an old established resource with the ‘dirty’ link profile.
It can be still ranked well and receiving solid Google referral traffic. But is it just a matter of time when Google will punish it for those ‘dirty’ links? Is it possible that one day you wake up to find your most successful site nowhere in the SERPs?
Would it be wise to clean-up the link profile now before it’s too late?
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Clean-up Your Link Profile Before Starting a New Link Building Campaign 
