I just bought a second VPI 16 cleaner. One is used for really dirty records, the other for everyday use. After cleaning a really dirty one it goes to the everyday use machine for final cleaning. Felt on everyday machine will not get so dirty if no dirty records are cleaned with it. I can also clean 2 records at once, I buy a lot of collections. Really dirty records may take 2 or more cleanings. NEVER use a volatile alcohol (Isoprpyl, Ethyl, Methyl etc) 1.They damage your records. 2 Alcohol does not clean vinyl. The only use for alcohol is to get more of the surfactant into solution. I manufacture cleaning solution, so I'm not giving any more clues. Double and triple distilled water is a wate of money. By the time it's exposed to the air for 15 seconds it's just as contaminated as regular distilled water. Save your money to buy records. I used to use a preservative, made my own and sold it for $15 for 8 oz. At this point, I'm not sure whether preservatives help, hurt, or has no effect.