...I still cannot read CR-R in my 6X reader...

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What worked for me recently was CAREFULLY cleaning the top lens only. Could read CDROMS but not CD-Rs before cleaning on multiple drives. Cleaned them all, now they all work. The plastic lens will accept a carefully placed small drop of distilled water from a wet swab. Let it sit to dissolve what it will then absorb with a dry swab. Repeat for a total of 4 times using a fresh swab each time. On the very last time only, wipe the surface exceeding gently, (dragging just the weight of the swab, no pressure) with the damp swab that has absorbed the last drop to pick up any solids. Then absorb any residual tiny drops with a dry swab, do not let them evaporate in place. There are multiple other optical surfaces that can attract haze, but they are impossible to safely access.