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The "green waxy substances" is something called verdigris, it's a type of corrosion. If all you removed was the verdigris then no, you didn't affect the value of the knife.
Some general advice- it's a good idea to determine exactly what you have before performing any type of cleaning. And then if it turns out that you have something valuable, seek out a professional to do the job to avoid reducing, or ruining the value.
Is it one of these? This is a New York Knife Co. display knife. Closed length is 11". If it is, don't do anything else to it. If it needs further cleaning, find a professional (ask here).
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