How to clean grout in shower of black Residue!
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Cleaning Grout With Homemade Grout Cleaner
Black residue is mold. Clean with straight vinegar then rinse.
The black residue is most likely mold that forms due to dampness. I have this problem from time to time and use a spray bottle with bleach to attack it. Wear a mask because the fumes can be overwhelming. Make sure that no towels are in the vicinity so as not to accidentally cause bleach stains on them. This should take care of the shower problem in just a few minutes.
Open window, spray bleach (extra duty-Home Depot), and scrub brush. Lynne
Undiluted bleach
Black residue sounds like mold.