Because many started burning the roll of toilet paper in the bathroom.

The toilet paper will not burn instantaneously, but rather gradually. Simply ignite the edge of the roller with a lighter and turn off the flame to remove odours from the toilet or any other drain. Make sure you remove any pieces of toilet paper you find before proceeding to this step.
Recycling of paper towels

Keep your eyes open, we insist on this several times during treatment. Assuming that no combustible material is nearby, it is safer to burn the toilet paper in the washbasin or another bathroom fixture.

The following page continuation