There is a big difference between Alconox Powder Detergent and Alconox Liquinox Amazon.com: Alconox - 1232-1 1232 Liquinox Anionic Critical Cleaning Liquid Detergent, 1 quart Bottle : Health & Household. Liquinox is a neutral pH detergent that is a combination of anionic and nonionic surfactants. The Alconox Powder Detergent is slightly alkaline and contains no nonionic surfactant and has limits for what can be dissolved. For general cleaning they may be considered equal, but for record cleaning you want the neutral pH Liquinox with its nonionic surfactants that have a benefit over the carbonates/phosphates for record cleaning - they add foam that is much more gentle to the record. Depends on what brush. The occasional cross-action is of limited concern with the Record Doctor brush. Other brushes with shorter/stiffer brushes there could be harm depending on how hard you are pressing. In general there is no benefit to brushing perpendicular. That is way too slow. This is what I said in the book: :Step 5....Applying only a light pressure (the brush handle can scratch the record), use the Record Doctor™ Clean Sweep Record Brush (or equivalent) in moderately short, fast, back and forth motions (such as two back-and-forth motions per second) that follow (are parallel to) the arc of the grooves, and clean the record both sides with the CLEANER solution." When you are brushing as addressed above, the brush should fill with foam. The quick back&forth motions are CRITICAL to agitating the fluid fast enough to get effective cleaning. If you are only brushing relatively slowly - you are not getting all the cleaning you can get.