Any lube that would stop front suspension squeaking?

It is possible that you have polyurethane bushings.25 years ago I did my Duster with polyurethane bushings. No one told me that you had to grease them.My squeak was from the sway bar bushings.A few years later some suspension companies started installing grease fittings in their parts.
I know what you are talking about. Man did they squeak ! Places like Energy Suspension or PST has grease you can buy.
In a pinch you can also use teflon Marine Grease that won't wash off.