This is carbon build up removal with Redline complete fuel system cleaner (Redline SI-1). Cleaning carbon build up is essential in engines. If you're asking is this fuel cleaner any good, or can it clean fuel injector without removing? Or you're just looking for a fuel system cleaner that works; that will dissolve carbon, this video shows what to expect with cleaning carbon from piston with Redline S1. It's one of the best complete fuel system cleaner additives that is good at carbon buildup removal
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Timestamps
0:00 - Intro
0:28 - Disassembly
0:54 - Baseline inspection
2:14 - Adding Redline SI-1
2:45 - Before vs After
3:58 - 2nd Treatment