I use this grease from nappa. See picture. Everyone has what works for them, I wipe it off when not in use. I hate dirty hands, so it's a few minutes I don't mind.
Most important do not grease L brackets. At most use plastic jackets sold by equalizer. I use the jackets more often than not. It I'm heavy highway I choose not to use them, too gain the mild added sway control, some is lost with there use. In theory they allow less friction so therefore less sway control. Do I notice a difference with and without. Not that I can tell.... so that's why I choose to use when situation is such that I may want all I can have.