Well I have got also a strong warning from my boys at the Greek forum, about those bits of glass fiber.
Some one had suggest an very toxic liquid called as tetra chloride, but he also suggested to avoid it, even if it can clean those fibers in few minutes.
And so I am looking for a substitute.
About 15 years back I was working as repair man in Omron cash tills, we was using a special spay as ink and grease remover from the printing heads,
I think that this could act as degrease agent, but its just a theory.