The Disc Doctor manual system works wonders for most records and supplemental steaming will handle the really tough cases. You were missing a couple of tools needed, mainly a cleaning brush and a rinsing brush. A RCM is totally unnecessary, IMHO. I've been collecting LPs over 50 years and have a revealing system.
For clean records I brush on the TT with a carbon fiber brush, zap with the Zerostat then wipe with a micro fiber cloth and then zap again. Most new records only need this. Occasionally a brand new record will benefit from cleaning with Disc Doctor, but I let my ears tell me rather than trying to clean already clean LPs.
All used LPs get the DD treatment and a very few get steam. (I don't buy visibly dirty LPs, in general, but the occasional promising record gets given to me and try to revive it).
Dave
For clean records I brush on the TT with a carbon fiber brush, zap with the Zerostat then wipe with a micro fiber cloth and then zap again. Most new records only need this. Occasionally a brand new record will benefit from cleaning with Disc Doctor, but I let my ears tell me rather than trying to clean already clean LPs.
All used LPs get the DD treatment and a very few get steam. (I don't buy visibly dirty LPs, in general, but the occasional promising record gets given to me and try to revive it).
Dave