This is a test of commonsense. Complete the next sentence:

How to wash acrylic fibers
Pretreat any stains.
You can't rely on detergent alone to get out a big stain on your acrylic clothes. Hit the spot with a spray stain remover and rub the remover in with your fingers so you know it's really worked in the fabric.
Don't forget to spray the stain remover on the inside of the clothing too. If it's a really old or stubborn stain, try scrubbing the remover in lightly with an old--but clean--toothbrush.