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Can you reach it from the drain end with some plumbers rods? I use the claw one to try and scrape away or grab hold of the blockage.
I managed to clean one the other day but the silt only reached the u bend which meant the entire length of my arm down the drain scrapping out silt. I was just about to give up and call dynorod when I got to the bottom of it.
In the past I've had Dynorod clear drains for £120.
A hole digger - kind of like big scissors with trowels on the ends.