Try to push the how to clean a spacer for asthma back towards your lungs as you inhale. Asthma UK Helpline Call us on 0300 222 5800, Monday-Friday, 9am-5pm. This will open your airways so that the medicine can easily flow into your lungs. The cap will slide away to remove the mouthpiece. Some research suggests that homemade spacers, using plastic bottles, may be as effective as commercially made versions, but homemade versions may have more variability. Do NOT use water to wipe the dry powder inhaler because the powder is sensitive to moisture. Merck Manual of Diagnosis and Therapy.