Any lube that would stop front suspension squeaking?

I have a 1971 Duster. I had pretty much everything replaced in the front suspension about 25 years ago. I’ve driven very few miles since then but the years have led to loud squeaking from the front suspension. I’ve attempted WD-40 and silicone spray on the rubber parts/interfaces that I can see - but minimal help. Anything I can do short of having everything replaced again? I also used a grease gun on parts that had the necessary fitting.