You are making a bit too much of this. It's not rocket science. Clean the area. A finger full of common or garden grease blobbed on the bolt/nut and covered by any old pot that is a push fit.Bump 😀
But also spend a bit of time poking out the drain hole inside the windscreen wiper spindle area as water running off the windscreen can overflow into the 'engine' bay if the drain is blocked and get into sensitive electrics. You will probably find that the drain hole is blocked by a winged sycamore seed.