CDs are manufactured in molds … mfgers use a mold release agent in the molds to facilitate removing the CD from the Mold easily … this agent leaves a waxy film coating behind on the CD that can degrade the sound … your first step to treating your CDs should be to use a agent that will remove this film from the mold release agent that is left behind in the mfgering process… once the mold release agent's waxy coating is removed … you can use your favorite cleaner and optical enhancer
Here's a link to a number of products that will remove this reside
https://search.aol.com/aol/search?s_chn=prt_bon&q=mold+release+gent&s_it=comsearch
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