I've used gojo hand cleaner before and it worked . If that won't cut it you could put a Lil gas on a rag to get it off that shouldn't hurt nothing just wash with soap and water after your done ....
Any degreaser or bug/tar remover will do the job, just make sure not to let it sit on the chrome very long and use the least aggressive approach you can. If the stuff you chose is water based dilute it as needed.
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