If you have the dummy plugs, it would probably be wise to pull the transducers, rather than try to repair them in situ. I don't know if the waxy substance can be removed without damaging the underlying electronics.
One thing you might want to do is see if there are replacement transducers available. Who made the instruments. Airmar makes many of the transducers, for several of the manufacturers.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.