stainless steel chimney, how to remove creosote on the outside?

just paid a fortune on 20ft of 6 inch double wall SS. ($980) saved a couple bucks and bought 3 sections on ebay, creosote on the out side of the chimney pipe. any product worth buying to dissolve, remove the stain?
looking back i should have bought all new. only saved $75 dollars and the old chimney looks like chit.

hoping someone says" oh ya go out and spray bla bla bla on the chimney and it just runs off, looks brand new..........
well is there an easy way to remove the stain?

thank you.
jim

Batman said:

I should add that while I don't always use ammonia, when I do I use "janitorial strength" ammonia. It can be found at Ace. It'll let you know where the cuts are on your hands, so gloves are prudent.

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well i tried the ammonia 50/50 with water and it did nothing. tried it full strength. again, nothing. read the directions on the bottle and it mentions to leave a bowl of it sit overnight and it will soften the burnt food on the inside of your oven. so i soaked about 8 rags in full strength and draped them over the chimney pipe and then wrapped everything in some plastic, let it sit overnight and BINGO! i just went out and it wipes off. may take a little scrubbing or maybe a more aggressive rag, the kind the wife uses to get the stubborn dried food particles off the dishes.
anyway thanks for the help. i doubt it will be as chrome as the new stuff but much better than having a black and chrome chimney i would of had.
again. thank you.

jim