I suggest that you work out a careful rota which will make it clear who tidies the room on which day.

我建议你制定一个详细的值班表，明确哪一天由谁整理房间。

...the washing-up rota.

洗碗轮值表

The tea is prepared on a rota basis by the lady members.

女成员根据值班表轮流准备茶水。