The first couple times I cleaned, I did that. It never seemed to effectively get all the resin out of the corners. My ultrasonic cleaner will also heat the water, therefore heating the iso, doubling the effectiveness. The actual ultrasonic part means I don't need to do any extra clean up and only takes 6 minutes. I run twice just to make sure though. The worst part of the whole process is 1. The initial disassemble because I don't clean frequently enough and it's a sticky mess, and 2. Drying everything off when I'm done so I can use it and getting antsy for the first super clean bowl.