I have a 25th anniversary Edition Dual sided Nitty Gritty RCM with the smoked cover and the beautiful Jatoba finish. In combination with the Shark, I feel no need for any solution. Just distilled water and the same process I have used for years. I clean each side before play whether it needs it or not and even on new LP's with great results. That said, RCM's have many deficiencies and IMO there is a need for much improvement.
Tom
Tom