What is the effectiveness 5-FU injection (fluorocil) to reduce mature scar-tissue in tip of nose?

I had an open rhinoplasty 5 years ago in which Kenalog40 was injected into the tip. The skin of my nose is relatively thick so I know its limitations. Although early use of 5-FU is preferrable, can 5-FU improve mature scar tissue (either 5-FU alone or mixed with Kenalog40). I would like to avoid getting another rhinoplasty OR am open to an outpatient/local-anesthesia procedure if the scar-tissue can be excised and overall symmetry achieved with relative ease/permanent result.