We recently remodeled our up stairs bath room. We installed a glass block shower where the tub used to be.
Unfortuneately there is a thin "skin" of green algae growing between the lower blocks along the grouted seams; seems like it was invaded through the loose grout application,according to the contractor




Any clues to removing/ neutralizing this invasive species?

Really don't want to disassemble this wall...

Any help would be much appreciated!