Squeak in Alcan DS rear leaf

Got an annoying squeak on every bump or dip in the road. I can re-create it by pushing down on the rear DS corner of the bumper. I've pinned it down to one of the spacers between the springs...any suggestions on what to put on that to stop the squeak? I tried silicone spray, that worked for a while but the squeak came back after about a week...

These are Alcan replacement springs.

Thanks...

 

pressure washer...... or just take out the leafs and clean em real nice and deep like...

 

Thanks, I'll give the pressure washer a go.

 

it helped for me.... til i went offroading again haha.... just make sure you spray it out reeaallly well!

 

my deavers do the same thing...for me it's the bushings binding up w/ the shackle when the springs are moving. grease em up REALLY good and it will help but prob not go away 100%...look into maybe getting some greasable shackles...i hear that helps

 

Thanks, but mine's not the shackles. They did squeak at first, and I took them all apart and greased them well. Those squeaks went away. This one is coming from one of the round pads between two of the leaf springs.