Crystal..Discus,
Thanks for your efforts to date and sharing your experiences and observations. Much appreciated.
My specific chemistry knowledge in this area is very limited.
Whatever they have used will not, by its very nature, be water soluble.
There are a range of organic hydrophobic chemicals That are produced naturally through decomposition of organic compounds. That is why soil with a lot of old organic matter that has been allowed to dry out completely is hard to rewet. Yet add some detergent and it will wet straight away. The detergent effectively "dissolves" the hydrophobic chemicals the same way it helps to "dissolve" fat. Technically, it emulsifies them allowing water to then move them.
Whether it is organic or otherwise, it is apparent that the detergent is removing the hydrophobic coating. I must say, it sounds like it might be organic in origin if it is producing a greasy residue. But that is just an opinion.
Blue