This is both interesting and yet un-surprizing. I am involved in with Industrial customers including many machinists. They consider Aero Kroil to be the number one by a hugh margin. What's missing from this "snapshot" but may be covered in the test data is what works best on severly stuck and or coroded metals. This is the real key. This also plays into price per fluid ounce. "Price" and "Cost" are not always the same. In a machinist's case, if a die costing many thousands of dollars is saved or repairs costing many hundreds are avoided through the use of an effective product, $.75 per ounce vs $.25 per ounce is not even a consideration if one consistantly works well and the other does not. I would imagine that the OP would gladly pay a few dollars more if the product works well. I have not used it personaly for this purpose but it has never dissapointed me on 20 year old fasteners, coroded shafts, etc. In my experience, PB Blaster makes WD40 look like child's play and Aero Kroil makes PB Blaster look like child's play. LPS makes a product, KB-88 that works almost as well. http://www1.mscdirect.com/cgi/NNSRIT...-SearchResults