Contaminate (transitive verb) means "to add a little bit of bad stuff to (something), rendering it bad". Or thereabouts.
Is there a word for "to add a little bit of good stuff to (something), rendering it acceptable, not bad"?
Or, less optimal, an intransitive verb, or a noun describing the action?
Best Answer
Perhaps remediate.
But it depends on the "good stuff" that's being added.
Other possibilities:
strengthen
rehabilitate
I also like @Kevin's fortify and purify from @MrHen's list.
I think nearly all of @F'x's suggestions are good, and @nico's answers are super-dope as well.