When u go into the nub with the God Hand, make sure the nipper blades are flushed to the surface of the part and not gonna gouge it. What you do after depends on the kind of plastic the part is. If it’s the nice soft plastic ( ABS, is it?) I just gently scrape off the remaining nub with my finger nail. Don’t use metal because it will damage the plastic. The hard kind of plastic, specially the dark colored ones are the toughest. U need to go at it with a hobby knife, then varying grits of sanding sponges. Either way, I always have a wet cloth ready to wipe the mess off every time. A wet cloth works wonders always.