Walker is not expensive but seems like a major hassle.
It is a great product and yes it takes time especially if buying second hand lp's and doing the whole process. Never exceeded 10-20 lp's both sides cleaning, enzymes have limited life time before dying (some hours), though i am not a chemist to verify that. After that, only the pre mixed solution or/and ultra pure water is fine if required. Transparency, inner detail, focus, are all increased, surface noise is dead silent, no residue, no static build up, and lp's come clean and shiny and stay that way for a long time. More experienced people on the subject may have found better solutions but after tried and used some of them myself i find the Prelude perfect.