I recommend getting both the anti-dustmite sheets and pillow covers as well as the spray!

A combination of all 3 legit stopped giving me a clogged nose at night immediately.

Edit:

Initial steps I put in the other comment:

My initial steps I took were:

• taking bed sheets and pillow covers to the washing machine

• applying anti-dustmite cover to mattress

• applying anti-dustmite cover to pillows

• putting bed sheets and pillow covers over the anti-dustmite covers

• spraying the anti-dustmite spray over and letting dry