George ....
1. For the ransom
Purchase 2-3 Tobacco Sachets from a supermarket and follow the instructions strictly. Use it in all the gutters you have to clear.
2. For wiping
Instead of paper since they don't make you .... get wet baby wipes to find your health!
I have never tried Tuboflo, but will probably try to see if it does anything ...
Okay now the water is leaving through the tubing, but if you unscrew the tube from the pistol and dip it 1-2 centimeter into the pipette and open the hot water mainly or the cold at the end with pressure, they will rise a little water back on the tile and it will become a lake ...
(so the waters are escaping little by little in the tubing - I don't know how far the obstacle is, 50cm, 1 meter I don't know)
... but closing the tap means in a matter of seconds the entire shower will be empty of water.
But I do not know if anything can be done with the flushing suction cup, the one used in the 3str4, if I also applied it to the 2-3-4 pipette and tramp, and by pushing the air in, they would block the air and block the tubing.
I don't know if it will work ...
As for baby wipes (he had) I would say (if I applied them) like Stathis Psaltis in Come to Naked Darling: "I feel like a freshness ..."