Recently my Toyota 2010 model started to emit noise when I'm driving slowly. A mechanic sprayed WD40 on the bushings and the noise was gone. But after three days the noise returned.
Ru-Glyde is the best safest rubber lubricant, but is only sold in gallon bottles.
My guess is dirt in the joint is the cause of your squeak. I’m assuming your bushings are either rubber or polyurethane. You could lube the bushings with vegetable based or silicone based grease but I suspect soapy water would also provide some relief. Using oil based lubricant on rubber or plastic parts is bad. The oil degrades the elastomer.
And its not totally clear on what parts were sprayed (Bushings on front struts / shocks? front A-arm bushings? Stabilizer bar mounts?) Exactly what parts are we talking about?