Silicone grease is what you want to use with poly.
Hotchkis Sport Suspension 3101 Hotchkis Sport Suspension Super Grease | Summit Racing
I use hotchkis super grease, they sell it in a full size tube for a grease gun. You can use the little tubes that should come with the bushings for initial install, but you’ll want something for a gun to use the zerks. I just keep two grease guns, one with regular grease and the other one with hotchkis super grease. Then I just grease everything at the same time. If you hit the zerks for your poly bushings on the regular lubrication interval for your other stuff they’ll never squeak.
