There’s this black stuff on a good long strip of the caulk around my tub, where it meets the tile walls. It is considerably stronger and smarter than me, and it never goes away. The last time it got this bad, I had to call building maintenance to have them strip up the caulk and put down new stuff; it was clean for a couple weeks, and then the black stuff started growing back.
This time, not wanting to be the guy who calls maintenance for every little problem, I took Maria’s offer of assistance and tried other solutions. We bought big strong scrub brushes. We used new and stronger kinds of tub cleaner. We tried a bleach-water solution. As a penultimate resort, we bought an evil yellow jug of ammonia, the only stuff that is guaranteed by science to kill mold and mildew.
Earlier today, I filled the tub with four gallons of hot water and two cups of pure toxic irritant and attacked it for an hour. I got almost all the tub and tile bright and clean, but the black stuff, untouched, just laughed at me with its thousands of tiny mouths.
I called maintenance. Everything tastes like ammonia now.