The investigators observed the time spend on surgical rub prior to an operation. The investigators do not record names, age, sex or orther features about the health care workers who perform the surgical rub.~After 200 observations a device will be attach to the dispenser that might help increase the time spend on the surgical rub in the operathing theather. The investigatos will then make another 200 observations to see if the device cause an increase in the time spend on surgical rub.
To study whether a device has a nudging effect on the time spend on surgical rub.