How can I reuse or recycle washing powder balls?

How can I reuse or recycle washing powder balls?

I posted an item from my mum last week about how to reuse washing powder tablet nets and it made me think of their solid plastic friend: those funny shaped ball things that you put washing powder in before putting the ball directly into the washing machine.

Ive got a few floating around from back in the day when they were the washing powder innovation du jour and since Im trying to move away from chemical powder onto soapnuts now, I have no need for them.

Any suggestions for reuses? Theyre really sturdy with a flat bottom but awkwardly shaped apart from that.
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