I worked the lube rack at Sears in the 60’s. We had a spray in a pump bottle of “rubber” lube. It would silence squeaking bushings for a while and worked best in dry weather. I searched for a product to replace it over the years and found Ru-Glyde 2 years ago. It’s a product that was for mounting tires and work pretty well. I spray the bushings with every lubrication on the zerk fittings. The more often I use it the quieter the front end has gotten. I watch where in spray it and wipe off the excess.
When installing any rubber product, including windshield wipers, I soak every thing in 303 Protectorant for at least 24 hours and found it does a great job. I use it on all door and window rubber every time I wash my cars or truck. It’s also great on tires also.,
This is what works for me your experiences may differ.
56 Vic, B'Ville 200 MPH Club Member, So Cal.