I use Audio Intelligent 3 step for every record, new or used, that comes into the house. Yes it's time consuming and generally a PIA, but nothing I've used, and that's about everything, is better. After about a year or so, depending on how many times it's been played, I use their No. 6 formula. I have quiet records and recommend their stuff highly.
The other day I cleaned a used Odetta album that was nearly 60yrs old. Admittedly, it was well kept, but it's as quiet as any other record I own, new or used.
For really dirty records, I use my Spin Clean first. No sense gumming up my 16.5
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