[Paul Plots]

toilet brushes are very good for cleaning anything 3" and bigger...

The mind boggles     

[Vit]

Why not to use them? It's recycling with "short cycle", otherwise[boring mode on] plastic pots will go to the chemical factory to be converted to plastic granules, then to factory, which will make pots again [boring mode off]. Reuse pots will reduce waste, but some people can loose some job. I would choose first - reduce waste 

[hightide]

I recycle any round pots to the allotment shop.

However all my square pots are carefully washed in a soapy bleach solution and reused.

They are never given away containing spare seedlings to family, friends or allotment colleagues, just so hard when they don't come back. 

Square pots fit in square trays, now someone please produce a square trowel/bulb planter.

[mumofstig]

You can get squarish ones at the garden centre! I noticed them a few weeks ago 

[Paul Plots]

I recycle any round pots to the allotment shop.

However all my square pots are carefully washed in a soapy bleach solution and reused.

They are never given away containing spare seedlings to family, friends or allotment colleagues, just so hard when they don't come back. 

Square pots fit in square trays, now someone please produce a square trowel/bulb planter.

Perhaps they will when there are squarish bulbs to plant