Updated 8 Nov 2018
Bottom line: Janola Power Clean Toilet Bleach Gel is a toilet cleaner that costs 7¢ per 10ml. It's good at cleaning toilets.
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We scan a tile with colour assessment software then stain the tile with simulated faeces, based on a National Aeronautics and Space Administration (NASA) formulation. Yes, such a thing does exist.
We then apply the cleaner to the tile and use a mechanical scrubbing arm to clean the tile. The tile is then rescanned to assess how clean the tile is. This is repeated three times and the results are averaged.