I've started using a pressure washer on my fermenter, it's a game changer.
I bought a multi angle adapter and just blast away.
Krausen rings no problem. if need be the zero tip just cuts it away, usually the standard tip does the job.
My kettle, it just blasts it away.
I keep it in the brew shed with a quick disconnect for the hose.
I bought one of the small electric units for ease of use and storage.
The tips are the standard tips that usually come with a pressure washer, the multi angle adapter allows me to hit the sides and is really what makes the difference.
This is the device.