Multiple unused bindings on playable director component from previous timeline

I replaced a timeline with another, reconnecting bindlings etc. However the old timeline is hanging out in the component in 'unused bindings'. This can happen multiple times if a different timeline is then added!

It appears they are then dragged into any builds.... which makes it hard to optimise.

Is there any way to remove these?

EDIT: Okay, so the solution I found: You have to delete the playable, drop the timeline onto a new object and reconnect the bindings. This is annoying if there are lots of course, but it does clear that issue and a number of other issues I was seeing.