Does pre-ejaculation necessitate Ghusl or Wudhu, and how should all clothing be washed?

If by the term ‘pre-ejaculation’ you are referring to premature ejaculation, then Ghusl will become necessary the moment semen emerges from the private part. However, if by the term ‘pre-ejaculation’ you are referring to pre-coital fluid emerging (due to being aroused) before proper ejaculation or intercourse, then the emergence of such fluid will necessitate Wudhu and not Ghusl. If the clothing is soiled with pre-coital fluid or semen, then it should be washed thrice.