Pete. great and informative posts on this thread! I am no way a chemist, but our hobby or job puts us all into a position to have to work with all kinds of chemicals, and preservatives. a vast amount of those were never intended for what they are used for in taxidermy. in the old days, sharing those materials and techniques were coveted and almost never shared. modern taxidermists, now can hear and discuss as well as trade what works for them. I have experimented and changed my avian de- greasing process more times than I care to remember. every aspect of taxidermy has to deal with bacteria and grease, but birds seem to be the only one that we soak in water without a chemical additive such as salt, acid or other setting material. therefor, IMO, any product used to clean birds should have a very low PH to help prevent slippage and feather loss. everyone's water composition also varies and can make what works for some not work for others. I have well water that goes through an elaborate filter system since I am 500 ft from the bay front. Stop Rot is invaluable to me, and has a PH just under 4. Kemsol PH @5, and Ultra Downey Clean Breeze with a PH of 4. my water is very soft with a PH around 6. I checked the PFD on this one, of many Downey products. It actually to my surprise contains formic acid as well as a mile long chemical added as a preservative. there is no mention of paraffin as part of its chemical composition, at least with the Downey I use. I also use a Coleman fuel bath, then hand dry with fine corn cob grit and potato starch.