The issue of cleaning fluid is pretty simple and there are a lot of good easy to use products on the market to fit anyones taste or particular situation. I have said it before, the purpose of any cleaning fluid/cleaning system is to get the junk removed from the grooves. As was said with audiofeil note, the majority of the product is water which is a wonderful solvent for ionic compounds such as salts but pretty poor for non polar compounds such as grease/oil/fingerprints.etc. Good cleaning solutions will have a component to help water emulsify the non polar compounds and a component to disperse the solids that will not dissolve. The tiny grooves also means a mechanism to get the cleaning solution into the grooves is required. Wetting agents can be added to help this or mechanical action by a brush will help get the cleaning solution into the grooves. A brush also plays an important function in that the mechanical force helps dislodge the particles stuck in the groove. THe last function of the cleaning fluid is to dry quickly. Again the use of a vacuum or dry part of a record brush can help. Alcohol is used in some formulations to aid in drying. IMHO, the most important factor is clean water that will not leave a residue. My favorite homemade formulation is 1 qt of water(triple distilled or better), 1 teaspoon of Dishwashing detergent and then enough alcohol (about 1 oz)so when a drop of cleaning fluid is put on a record it freely flows into the grooves. I use an old discwasher brush and this formulation has worked for me for almost 30 years. I have found though heavily fouled records will require a machine like the VPI to get the mechanical action from the brush and lots of cleaning fluid.