Ammonite in ultrasonic cleaner

This video shows a pyrite nodule with a couple of ammonites in it being cleaned in an ultrasonic cleaner. The nodule had already been cleaned thouroghly by warm water and tooth brush. The ultrasonic cleaning got the clay out of the fine cracks. It's not a dramitic improvement, but illustrates how the ultrasonic cleaner gets stuff out of hard to clean spaces. The nodule is from the Dorst Coast, England.