I'd really recommend you do it manually, just take off the top cover of the drive and use a bit of IPA on cotton bud and gently brush the heads, just don't press on. The bottom head is more sturdy than the top so brush the top head really gently.
The problem I find with the cleaning disk is you get dirt in the same place on the disk unless you have a program that moves the head while it's in! Never liked them so I do mine manually!
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