Holly S%^&t, People actually believe you can by a "fix" in a F%^&king Can.
Guys, easy fix, did mine after 30K. Remove the tensioner, take out the bearing/pulley (it;s a molded pulley on a bearing assembly), remove both pop-seal off the bearing Then clean it out. You'll find the bearing grease as gone dry and hard ...duh that may be the cause for the squeaky noisy thingy!!!
Re-pack the bearing with a QUALITY grease (I used Mobil1) pop the seals back in and re-install the tensioner.
DONE, 1:15 minutes. Hardest part was removing the engine mount to access the tensioner. Hint: use a carjack with a piece of soft wood under the oil pan.
Go back to the store and get your money back on that "fix in a can" S$%^t
DO I SOUND BITTER?