you don't use wd-40 on the belts. Smack smack. It's a good way to make the belts deteriorate quicker. When wd-40 dries it leaves a film on the belts causing it to attract MORE dust and dirt which will cause them to wear quicker AND causes accelerated drying of the belts making them more brittle.
You can use Belt Dressing spray. I have a bottle of it from Pep Boys.
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