Remove stopper, then try one of the plastic hair clog removers from a big box store. It looks like a long plastic strip with teeth on the edge. Slip in it as far as you can, then gently pull it out with the hair and other crud stuck to it. I'd use gloves as it can be messy.
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'The Silver HamShack' (2007 International 22FB CCD 75th Aniversary model)
Multiple Yaesu Radios inside and many antennae sprouting from roof, ProPride hitch
2012 shortbed crewcab 4x4 Toyota Taco TV with more antennae on it