If you really lack brains you could cut the third pin off. If this potential is great enough, an operator touching the chassis of two ground lifted devices faces the possibility that the shortest path to ground exists through his body. Although I have met some metal heads who disagree, no audio project is worth being electrocuted over. Buffs head in direction of travel. Buffs static guides.
Abrasives clean well, but decrease head and guide life immensely.
Do a bit of a better job because of solvent action. Do not make over wet heads, because the solvent will' creep' into bearings and decrease the bearing's life. Make certain the solvent is safe for all plastics and composites. Check the label. Most are safe as plastic omponents are invariably used in some part of tape path regardless.