nukecad, your answer is incorrect. These are NOT SSDs, they are external USB spinning drives (in most cases). You can hear them make hard drive noises when you are accessing them. The one I'm trying to wipe right now is 10TB, that's NOT an SSD for only $200. Western Digital MyBooks for example. /r/DataHoarders shuck these for the spinning drives. The first result when I googled this problem was from 2015, so this has been a problem with CCleaner for at-least 5 years.
A bug is a bug, regardless of whether one pass is "sufficient" or not,