I use Klaudio's ultrasonic machine and distilled water and that suffices for the vast bulk of my LPs. For the occasional used LP that is in really bad shape, I have a Nitty-Gritty machine and use Record Doctor fluid.
The beauty of the Klaudio machine is that it is a one-step process: Simply place the LP in the machine and walk away - you'll have a clean, dry record when the cycle is finished.