There is a product known as the Camping Butler which cleans cartridges in mobile toilets of the type used in some caravans and motorhomes. It does its job fully automatically and completely contact-free from both the inside and the outside, no matter how full or grubby the cassette is. igus is highlighting how it works in a video, as the units feature a selection of its products.
The linear cleansing robot is built using the company’s drylin ZLW belt drive units with stainless steel components for easy cleaning. Each of the axes is driven by stepper motors fitted with encoders, and a 360-degree rotation of the cassette during cleaning is achieved by using a curved gear rack featuring an igubal-based suspension. All of the chainflex power and control cables (and the cleaning fluid and freshwater hoses) are safely guided using E4 and Z16 e-chains from igus. Once the cassette is cleaned a door is opened, and this is driven by DC motor with worm gear and drylin W linear guide. Just goes to prove that you can’t beat the cistern.