The Dutch word for dust is
stof

Dutch Definition

stof	©
1. n-n. dust
2. n-f. Substance in general, matter, material.
3. n-f. A specific substance or material.
4. n-f. A textile fabric.
5. n-f. A subject, topic(s), something to think about or discuss.
6. n-f. A curriculum or syllabus

afstoffen
1. v. to dust off, to clean by removing dust
Ik heb die oude vaas afgestoft. - I have dusted that old vase.
2. v. to brush up, refresh, rekindle (knowledge)