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20 days agoBecause you don’t have a driveway/hose, I would try something like the Simple Green “OxySolve” cleaning concentrate (it says it’s for power washers but there are mixing instructions for “manual cleaning”). Most concrete cleaners have some pretty harsh chemicals in them that could damage your bathtub, but the Simple Green stuff seems pretty tame.
Basically, the anonymous peer reviewers told the authors “you should cite these additional papers in your work”. It’s expected that any such recommendations would be relevant to the topic at hand, and therefore are worth bringing attention to, but the authors clearly do not agree that they have anything to do with their research.