I use _weak_ IPA on one end of a cotton bud to wet the dirty spot and then use the dry end to gently scrub/dry. It's slow but works most of the time without destroying disks.
Note: If your drive was used to read mouldy disks then the heads are probably dirty too and will need cleaning.
[edit, thanks dlfsilver]
Last edited by breech; 27 August 2021 at 13:21.
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