Any lube that would stop front suspension squeaking?

Using something like Slick 50 is good for diagnosing the issue, you spray one joint at a time until you find what’s squeaking. But once you’ve figured out what’s making the noise you either need to use the proper grease, or replace the worn out part.

A rubber bushing shouldn’t need any lubrication if it’s working as designed, nothing is sliding or rotating on two different surfaces so nothing will squeak. A shot of slick 50 will temporarily stop the noise, but it doesn’t solve the problem of the bushing being worn out to make the noise to begin with.

A poly bushing will also stop squeaking if you hit it with slick 50, but again, it’s only going to work temporarily. You need to add the proper poly grease to actually solve the issue long term. Or replace the bushing and grease it, if it’s been squeaking long enough to have deteriorated the bushing.