"Eddy" wrote in message
...
nightjar .me.uk wrote:

Anyone already come up with an effective solution to this problem?

Find a close fitting, heavy, ball and drop it down from the top.

Ingenious, Colin! And put a good strong net up in front of the grate so
it doesn't charge out when it hits the bottom and dive straight into TV
screen?

Personally, I would put a sheet across it, as that will catch all the
rubbish dislodged by the ball at the same time. BTW the ball idea comes from
the Paris sewer system, where they use it to clean a tunnel under the Seine.

Colin Bignell