Wash bedding weekly. Wash all sheets, blankets, pillowcases and bedcovers in hot water that is at least 130 F (54.4 C) to kill dust mites and removeallergens. If bedding can't be washed hot, put the items in the dryer for at least 15 minutes at a temperature above 130 F (54.4 C) to kill the mites.
Wash bedding weekly. Wash all sheets, blankets, pillowcases and bedcovers in hot water that is at least 130 F (54.4 C) to kill dust mites and removeallergens. If bedding can't be washed hot, put the items in the dryer for at least 15 minutes at a temperature above 130 F (54.4 C) to kill the mites.
In between washing bedding I use this homemade spray:
1/2 cup rubbing alcohol
1/2 cup water
20 drops of essential oil
Spray on bedding about once a week. Don't use around small kids or if you are pregnant. Allow to items to dry before using.
You can put stuffed animals and throw pillows in the freezer for 45-60 min.
https://www.hometalk.com/diy/outdoor/pest-repeller/how-to-get-rid-of-dust-mites-5422931
How to Get Rid of Dust Mites