On May 2, 9:25 pm, "Steve Walker" wrote:
Matty F wrote:
On May 2, 7:37 pm, Les Desser wrote:
Just a word of thanks for the advice to run a length of string down
the inside.

Did that yesterday with 1/4" nylon rope and it seems to have solved
the problem!

That will also greatly help the rats to climb up the pipe!

for a rooftop protest about their conditions?

The rats go up the pipe to the roof and look for holes to go into.
Corrugated iron has lots of rat-sized holes especially for rats!