Read the text and determine if the sentence is true:

How to wash linen curtains<br>Machine-wash your curtains if they are made from a more durable, thicker linen. It's the most effective way to thoroughly clean the dust and dander from your curtains. Be sure to check the backing of the curtains to make sure they can be laundered this way.

Sentence: Dust and dander could still be on your linen curtains after washing.
It's impossible to say