First of all, what kind of knife is it? Is it a rare collectible or just some junker?
What do you mean by "pattern?" It it etched, engraved, inked?
Also, why does it need to be cleaned? It there just dirt? It it patinaed? Is there rust?
Finally, what outcome do you want? Do you want the blade all nice and shiney? That may not be the right thing to do for a valuable collectible knife, you know?