The brush is like this one:
https://www.screwfix.com/p/bailey-d...gclsrc=aw.ds&dclid=CP-Y1aSe0NYCFaOHUQodJhwBUA
The description says it is for cleaning drain walls.
https://www.screwfix.com/p/bailey-d...gclsrc=aw.ds&dclid=CP-Y1aSe0NYCFaOHUQodJhwBUA
The description says it is for cleaning drain walls.