Sperm blockage! seriously! Help!?

Ok, this may sound wierd ~ but here it goes. I was my... bits.... after ejaculation... cause I don't want my GF to get pregnant, but condoms piss me off :) Anyway, I do it in the sink. Sinks blocked, cant take it apart, SICK EWWW what will dissolve the... erm... certain organic material which blocks it? Tytytytytytyty so much anyopne who answers