2 sentences

1. 雨后的天空蓝得透明，一尘不染。

   yǔ​hòu de tiān​kōng lán de tòu​míng, yī​chén​bù​rǎn.

   After the rain, the sky was a clear, spotless blue.

   Source: Dong Chinese Dictionary

2. 这位护士一向爱洁，她负责的病房总是一尘不染。

   zhè wèi hù​shi yī​xiàng ài jié, tā fù​zé de bìng​fáng zǒng​shì yī​chén​bù​rǎn.

   This nurse is very clean; the ward she manages is always spotless.

   Source: Dong Chinese Dictionary