Blue Magic works good and is easy to find, a little pricey these days but what isn't. 3M chrome and metal polish is good too but more expensive and harder to find.
Even the cheap Turtle Wax chrome polish at Walmart does the job but with a lot more elbow grease required. To my knowledge steel wool is a major no-no on chrome.
The polishes work, you just have to put in the effort, bad news is chrome bumpers rust from the inside out, eventually a hole will form.