As I've been going through all these issues of Playboy in chronological order, I've found some good stuff in the comics department. Here's even more
there were even books about it. Some of it is true to this day, some was just rumor. Here's a piece Jack Cole did about it for the September 1958 issue.
also September 1958
Quincy Magoo is playing with his Soaky toys! - C. 2019 Rick Goldschmidt Archives
19 minutes ago