Near me, there is a popular and well used shared use path, next to a main road. It constantly gets covered in a sort of gritty gravel, that comes from the adjacent road where the surface is breaking up. The road is managed by Notts County Council. I put in a request to them to get the shared use path swept, but it turns out that the path is managed by the Borough Council (Newark and Sherwood, in this case), so I had to put in a request to them to sweep the path. It did get swept about a month after I put the request in, but within a week or so, it’s back to being covered in gravel/grit again, due to the continuing deterioration of the adjacent road.
I even spent and hour or so sweeping it myself one time, with the same result - a week later it was covered in gravel again. What is needed is that it gets swept weekly,but that’s never going to happen.
I recently finished reading Laura Laker’s book - Potholes and Pavements, which reveals that most of our National Cycle Network is built on a wing and a prayer, using whatever short term grants and funding are available. It’s a wonder that any of it ever gets built, and it can take decades of campaigning to get sections completed. And there is NEVER any funding for ongoing maintenance , which is why some of it falls in to disrepair and much of it is left to volunteers to keep it clear of vegetation and rubbish.