Hi There. I have only just joined on to the site. I am building Gunge Tanks. These Tanks arent ur average Chain activated gunge release mechanism's these r state of the art that can be activated by a remote control or even activated at a certain time when required. I am a electrical engineer and fabricator with years of experience. These gunge tanks r going to be one of the best on the market.
Someone on here made a device that could go on their shower and release a small amount of gunge almost randomly. If you did something like that - small, easy to set up and put away in a cupboard - I think you'd get more interest than gunge tanks. TBH, gunge tanks are pretty specialist!