You gotta love the mystery floaty stuff! I feel for ya Jeff, I just went through an outbreak of "stuff".

I found the following document that you may find helpful, but you may not like the direction is takes you. Page 5 has a photo similar to what you have posted...I'll let you be the judge. With a little luck, page 10 may be it instead.

Pay attention to the odor descriptions.

https://www.townofchapelhill.org/home/showdocument?id=28866

Fish on!,
Noel