If you feel any binding or have to manually move it back into position, it's worn out Replace it If the tensioner checks out, use "belt dressing
"an automotive stethoscope to identify the source of the squeal.
Optional AutoGRIND(tm) increases belt life due to more frequent belt dressing
and results in higher production with more consistent results.
The old belt dressing
contained a good deal of resin, along with cod-liver and neat's-foot oil (I looked up the ingredients in modern spray-on belt dressings
and it's a bunch of obscure chemicals that I don't recognize).
, cleaner, dye, electrical coating, ink, layout fluid, leather preservative/cleaner, lubricant, maskant, mold release and rust converters are not defined.