Long story short. I had a continuous squeal with my old belt, tried some wd40 and it went away for a bit. Cleaned up the pulley's and changed the belt. Squeal was back from the start but was only once every rotation. I changed the idler and tensioner pulley and same thing, they were bad anyway. I cleaned the old belt with light soap and water and it was quiet for about 5 min. WD40 again and it went away. I hand rotated all the accessories and none of them made the noise. Am I safe to assume that it is a belt issue and even the new one is bad? How can I determine if the tensioner itself is bad without replacing or using a puller tester? Thanks ahead of time for your opinions.