cleaning bin/tools after plastering - where's the best place for the remnant plaster - bin?

Yes and yes.

The pro plasterer I'm using at the moment usually leaves a small pile of surplus plaster on the floor on empty old bag to go off overnight - they look like elephant turds - very artistic.

Personally when it's me at home I always try and clean up with a hosepipe, and chuck the debris on the garden somewhere.

David

Thanks.

You can leave to dry in a newspaper or any kind of bag, then bin it - it's less messy than when it's wet

Yes, skimming sets even under water.

Slop buckets and trowelling up water can be poured onto the soil - it's mostly gypsum and is harmless....school chalk is made out of the same stuff.

I pour it over the lawn. In one place there was a dip in the lawn where I suspect a plant had been removed, and I concentrated on that part to fill it in. The grass grows very well in the plaster slurry/slops.

Yes.