<human>: Goal: How can I clean the dust from knick knacks?

Which of the following methods is more reasonable for accomplishing this goal?

OPTIONS:
- Use warm soapy water and the flat side of an old toothbrush.
- Use warm soapy water and the bristle side of an old toothbrush.
<bot>: Use warm soapy water and the bristle side of an old toothbrush.