I’m much more interested in the conclusions and the meaning of the numbers, for two big reasons:

• It doesn’t matter much if the reduction is 90%, if the remaining 10% is still enough to be a problem. It sounds like a lot, but I have some doubts that it actually makes much difference.
• I care a lot more about locations outside the toilet than the specific locations in and on the toilet. The toilet is assumed to be contaminated regardless, the question is whether or how much it is contaminating the rest of the room.