In my experience, there's no substitute for a vacuum-type LP cleaner. It doesn't need to be one of the fancy, automated ones. The basic, spin-the-disc-yourself models work every bit as well -- and they're much less expensive. Before buying a vacuum-type cleaner, I used one of the older, higher-quality Discwasher brushes. They work pretty darn well, but there was an immediately noticeable HUGE improvement in sound after I started cleaning my LPs with my first vacuum-type rig.
95% of the vinyl that I buy is used -- and the records are usually in less-than-ideal condition. So cleaning them well is very important. Generally speaking, I've found that a VG record will sound like a VG+ record after it's been thoroughly cleaned. Likewise, a VG+ LP will sound like a NM- (or better) record after cleaning. Cleaning also extends the life of the record -- as well as your stylus. So, all things considered, I think they're a "no brainer" piece of equipment for someone who enjoys buying & spinning less-than-pristine vinyl. Massive bang for the buck.
Right now, I use the Record Doctor V, which can be had for about $200 via online retailers. I'd recommend it. (No commercial connection.) When it comes to cleaning fluid, I like VPI's solution best. And I actually prefer their concentrate over their pre-mixed stuff. (Again, nothing to gain for me financially here. Just one dude's recommendation. )