Snap, crackle, pop

IME, an enzyme-based cleaning solution is the best cure for most snaps, crackles and pops. I have a $2K Loricraft RCM (one of the best) but cleaning with just surfactants ("soap") and rinsing does not remove everything.

The grunge in LP grooves provides a breeding ground for microbial growths. Many of these (or their carcasses) are not easily dissolved by surfactant action alone.

Enzymes, however, are chemically designed to break down organic matter. They will attack and help dissolve stuff that soap and water will not.

Having compared 4 brands, my best results come from AIVS solutions, with their Enzymatic being the most effective for removing snaps/crackles/pops.

BTW, having dissolved all the gunk in the grooves you still need to remove it. A Spin Clean, while economical, will not remove all the grunge-laden liquid before evaporation begins. Allowing the grungy liquid to evaporate leaves the grunge behind, probably broken into smaller particles that may be even harder to remove.

A vacuum-based RCM is the only way to quickly remove grungy fluids before evaporation undoes the work you began with the cleaning steps. You needn't spend $2K, but if truly clean records are your goal, you need to do more than spin.

My experience and $.02...

Some preamps will emphasize ticks and pops as well!

Sometimes the loading on the phono cartridge can help too; a lot depends on what cartridge you have and the phono preamp.

You can get enzyme based cleaning solution at much lower price tag. Once audio comes onto play the price bumps-up 10x at least. It's simply an enzyme based surgical tools cleaner which retails anywhere from $50 to $100 per gallon(check amazon http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=surgical+enzyme+cleaner).
1 gallon can clean about 2..3,000 vinyls depending on contamination and it works indeed best.
Ultrasonic cleaners usually consist of an ultrasonic bath.
To fit 12" record size one should retail at $3...500 range depending on width and electric slow-rpm motor or one with reductor. Also you'll need to put together some frame for the motor. Plywood is fastest and cheapest approach to build it.
With ultrasonic cleaner all you need is distilled water, but if vinyls are highly contaminated, I'd purchase one of those enzyme cleaners in smaller quantities if possible. A gallon would be sufficient for 5k vinyls if not more when using an ultrasonic machine.
Dryer is optional especially when using enzyme cleaner. Vinyls will normally dry out with no residue at all, but optionally i'd build one using blower motor and pipes from the hydroponic gardening equipment.
Purchasing separate ultrasonic transducers and SS bath may save you even more since you don't need heater that usually supplied with any ultrasonic bath

hand scrub your records with a disk doctor brush and Audio Intelligence No 15 pre-wash enzymatic. Wipe it dry with a micro fibre towel and use the spin clean with distilled water for a rinse. Dry your record with a clean micro towel and let it dry for twenty minutes in a plastic dish rack. Short of that, buy a better record cleaner.

I also would look for a speaker that has a very flat response in the treble region...an exaggerated treble will only emphasize the issue...and like it or not...noise ...or varying degrees...has always been part of
the listening experience...I buy primarily used wax myself and have had good luck but there is the occasional turkey...some good advice...I also look for a sharp outer ring...all things considered ...this implies little 'handling' of the record was done...which equates to minimal play...also...depending upon scarcity of the LP...buying another copy hopefully improves background noise...