@Rob Fisher I like your approach of a hot water soak
Weren't you using the ultrasonic at some stage?
Yip, I went off the UltraSonic because it buggered up O-Rings and made marks on my aluminium REO's... it also dislodged magnets from REO doors. I just find the Ultrasonic to be too severe on some vape gear... I find hot water and well rinsed is the way to go for my Dvarw's...