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Re: Aries windvane maintenance
Don't use auto grease or WD-40. Both attract and retain salt.
Over here is marketed a spray product called 'INNOX'. I think it originated in Canada, so should be available in the USA. The trawler fishermen here use it for any light lube work around their boats and put me on to it. I have used it for many years with good results, even on my sheet winches.
The same company also flogs a product called 'Lanox' which is more greasy (being lanoline-based) and good on steering cables etc if they are below decks.
If you must use grease, I would suggest proper marine grade winch grease or outboard motor steering bearing grease.