Ewwwww.... it depends on where the fluid is I guess. Could it be the other side of the ear drum? If so you will need to see a doctor, I think they have drugs that can help.

I have occasional problems with was build up and find that using the hydrogen peroxide stuff (Otex) and then about 5 mins later using a solder sucker bulb filled with hot water to blow it back is very effective. I have once had it syringed by the doctor - it is a strange but vaguely satisfying sensation!

Gareth