What is a ‘duct cleaner’? It’s basically a metal cleaning tool, and it’s everywhere
The first thing you notice when you’re looking at a bathroom sink is that the floor is coated in an oily black material called duct tape.
This is the stuff that keeps your toilet seat from sliding out when you step off the toilet and lets you get it on and off quickly, without getting dirty.
It’s also used to scrub and clean the inside of the shower head, as well as to keep the water running when you shower, which is why it’s so important to have it on.