I leave it alone. Grease is never bad to have on and around moving parts that are put under a load. It’s keeping water and dirt away from the fitting when I’m out in the field. I wipe it off with a shop rag before re-greasing but that’s it. Have you ever seen a rusty zerk? Not on anything I have. Never had one clog either. Did have one fall out once that wasn’t tightened at the factory. I think when they’re clogged, most times it’s because old grease has solidified. That’s hard to clean out. It’s also a good idea to lube all the fittings on attachments before storing in the off season, especially if they sit outside.