pure spite & working at a 2 month old store

no but for real my store does them every day (on top of being new) so they dont generally get **that** nasty. i just use that little two sided sponge (not a brush), run water through/over the drain before i start scrubbing, putting soap both *on* the sponge and around the drain, and filling a trenta cup with water to use for rinsing the sides of the drain. i also go over them with a dry rag once i’m done to mop up the cleaner residue left on the floor.

Drain stains are also gonna vary from city to city depending on water hardness.

Wouldn’t tea water just stain them even more?

feel this 100%

There's is a cleaner simply called Liquid Disinfectant, I think, which is a white, paste-ish liquid - mostly bleach, but thick enough to stick to things. Use that (sparingly - a little goes a long way and will definitely bleach your clothes - and definitely with gloves) along with a rag, a scrubie, or my store has a dedicated urn brush that isn't used for urns. The drain pieces can be washed in your mop sink, but not your dish sink because this cleaner is NOT food contact safe! Scrub, rinse, optionally rinse with sanitizer water. The yellow spray is for things like counters and door handles.