Under-seat drain clogged - Help

As the title says both of my under-seat drains on our 2016 TI are clogged with debris. Cleverly, the ball that seals the drain appears to be connected to the fitting on the hull.

How can I clear these out? I tried unscrewing the fitting on the bottom, but there's not enough slack in the small line to move it out of the way enough to clear the stuff out.

TIA

Try a waterhose from the hull and spray the durt up?
Never had that problem but that is what i would try
Debris comes in from the top so it must be possible to exit from the top
Good luck
Peter

Thanks for the reply. I would try what you suggest, however because the "stopper ball" is directly connected to the fitting on the bottom of the hull, I can't pull the bottom fitting out of the way to be able to rinse it out. If I could move it out of the way,, I could dig the debris out from the bottom.