Best value record cleaner/cleaning system

Spin clean and fiber wipes are of no real comparison to a good vacuum machine. I  used to have a VPI 16.5, but it leaked so I recently got the new Pro-Ject VS-C, a superior machine to the VPI, Okki, and Nitty Gritty. Quieter, greater suction, bi-directional, ease of use! If you have a collection of an size, it's well worth the cost to get a real RCM. And the difference in sound quality is nothing short of amazing! I have albums I've owned for 40 years, I thought were old and worn out, lots of surface noise, pops and ticks. A thorough cleaning and it's new again! No surface noise at all! Jaw dropping results. Records don't wear out, they just get dirty. 

I have been happy with my VPI 16.5 for 26yrs and still works perfectly.
 I then found out about Dave Burton- "Record Genie" his service will clean your records with an Audiodesk or Klaudio ultrasonic machine or both. Also uses a Furutek D'Mag.
Very worthwhile if you want to experience CLEAN Vinyl. Reasonable prices and uses media mail to keep costs down 
Highly recommended, Try his service on some of your prized records. You will want to do them all !!!

I use sandpaper. Fine grit is best. 

Okki nokki is a great choice. Make sure to empty the tank after each use. You have to tip it toward the hose end to get all of the fluid to come out. If you leave fluid in the tank the arm tube can swell and not move freely. If you leave it in too long it can get chunks of crap in it and can cause problems trying to drain it.

Let's go another tack.  I recommend ultrasonic cleaning. It yields far superior results to Nitty Gritty (which I have) to VPI (which my friends use).  We have conducted tests by cleaning ultrasonically after using the prior machines and the sound is so much clearer, better detail, much better imaging, etc. The effects are the same whether you use beat albums or those brand new. In fact I have had good luck buying original Blue Note recordings all scuffed up for a few bucks and after cleaning they are decent and listenable.
I resisted this as I did not want to spring for the expensive German machines $3-4,000.  Now there is an excellent alternative. I purchased a system from Cleanervinyl.com for $550 and an ultrasonic machine recommended by them for $170 on EBAY.  In the past 2 months I have cleaned over 2,000 records! I would say the results are close to going up a level in Record Condition and are great for beat up albums.
I have a few friends who purchased this system and are very happy. It looks pretty cheesy and for the money it looks ridiculous. However, I am buying the results and they have been excellent. The system is not cheap but it justifies the expense.