With Knosti I used a mix of IPA/ water/ wetting agent, because it was dirt cheap. I switched to L'art du Son when I bought an Okki. I have the RCM in my work room, which is quite small. Cleaning the records with an IPA solution during winter was an issue - it's no fun cleaning records with an open window at -10C outside. IPA smells quite bad so you really should have good ventilation. On the other hand, L'art du Son has no ugly smell (it actually smells quite nice) and IMHO room ventilation is not necessary. Although the cost of L'art du Son is quite steep, I reckon a bottle should be good enough to clean around 700 records. I mix the solution 1 ml fluid to 50 ml water before cleaning the records, it is enough for around 7 records, so one Knosti drying rack.
TT: Sony PS-X65, Rega RP6; Carts: Benz Micro Ace SL, Denon DL-103R, Denon DL-110; Phono stage: Nuda dual mono
Digital: Rotel RCD-965BX, rDAC; Amps: Rotel RC-995/RB-991, Speakers: Dynaudio Contour 1.3 mk2