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> Flushers report finds of motorbikes, prams, coins, phones and jewellery – and once a live hand grenade.

OK, I understand coins, phones, jewellery and even hand grenades. But how do you flush a motorbike or a pram? :-O

When you're cooking with motorbikes, it tends to accumulate at the bottom of the fryer or pan as a hot liquid which can be put down the drain, but re-solidifies once it hits the cold water in the sewer.

I imagine people open the sewer cover on the street and push stuff in.

Or dump them in creeks and open channels which may drain through combined sewer systems. It's common to have signs posted around storm drain systems telling people not to dump waste in there, which obviously means people do dump waste in there.

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