Originally Posted by 67fastbackguy
Any suggestions for something to spray car undercarriage joints that squeak with anything other than WD-40 which washes off?
If it's the spring perch (like matcox suggested), you can get poly bushings for it and then use a lithium based grease on it, not petroleum based. Also could be where the lower control arms bolts to the frame, that's a non grease zert joint. You could put polys there as well, but if you replace those you'll have to mark carefully the location or get an alignment after.