I'm with Frank on this one. Please do not use anything corrosive or anything sharp or harder than the drain line to clean out an obstruction.
A short blast of compressed air is more than adequate to remove whatever is causing the back up. You dont even have to mop the water from the cap well, the hydraulic action of the air pushing on the water helps to remove the clog.
If you use a wire, it will gouge the line at a bend.
The aux tank drain line is fairly long, as it runs from the cap to the leading edge of the inboard flap segment, and it has at least one 90 degree bend in it.
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