Soap in my toilet creates foam that obscures the sights of shit, plus I tend to be in a hurry to wipe my ass and throw the toilet paper in my toilet, and it covers it further.
The third reason is that I forget to do it, and the fourth reason is that I usually do not know if the end result would be photographic until it is done, but it is usually not, so I do not fetch my phone in time.
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From @atempt