Wasps in mast
We had bees in Rio Dulce, Guatemala. First cousins, anyhow.
By all means, spray up the mast. The marina squirted stuff into the halyard exits.
The thing that seemed to work, finally, was to tie a messenger line to the shackle end of each halyard, saturate the last 20' or so of each halyard in full-strength liquid insecticide (coil them down in a bucket and pour the stuff over them), and pull the halyards up in to the mast.
Next day, use the messenger line to retrieve the halyards, re-soak, and repeat.
And again. And again. It took us about 3 weeks.
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