Bon Ami, sprinkled down the carb as the engine was running.
At lease that what I used to hear when I first started working on cars, about 50+ years ago!
Never tried it and wouldn't recommend it. Run it hard or tear it down.
'64 Sport Fury, 528 Hemi, FiTech EFI, 4-speed, 4.10 Dana 60 '57 Belvedere 2dr sedan, current project in process '19 Cherokee Trail Hawk Elite '03 Ram 2500 CTD HO, 6-speed 214,000 miles and still going strong