wiper pivot lube

Hello FABO, With the help from @davescuda the zerk fittings and nylon bushings are installed on my wiper pivots, my question is whats the best lube to shoot into the pivots?
synthetic? or regular grease that you would use on a ball joint? any help or suggestions are appreciated..Rich

By the way, i used the cheap auto part store nylon bushings and had a really tough time getting them to seat properly, i greased them and poked a hole in the ends and even warmed them up... In the end we tore them all off and went to the local DODGE dealer and they were in stock.
They were kinda pricey but they were night and day different, they pressed right on and fully seated with little effort, just something to think about next time...see you at CARLISLE...Rich