its so messy, and it goes everywhere and its very hard to get off your fingers.
I have great respect for electricity and I would rather be cautious than to have a bad situation. Others may surely disagree, but if this was my home, I would replace all the stuff inside the metal electrical box and make sure that non of this stuff was touching any wiring connections.
metal electrical boxes were intended to keep foreign material and surroundings away from the actual connection locations. These metal boxes were to keep out exactly what you put in.
I would shut off that circut, remove the switch or plug, thoroughly clean out all the stuff if possible if not add new, then re connect.