My son has a grade 6 allergy (anaphylaxis) to dust mite, you need to be very strict with your cleaning and maintenance routine.
We deep clean his bedroom once a week as well as the house, we use a combination of freezing his bedding ,steam cleaning and hot washing every week and a strict daily routine.
For his bedding
Firstly we bought him a new hypoallergenic memory foam mattress and all hypoallergenic bedding/duvet/pillows and mattress protectors x 2.
We hoover his mattress every day and steam clean his mattress weekly, after we steam clean his mattress we UV light his full bedroom for a few hours.
In the mean time we freeze his bedding (duvet, pillows and protectors) for over 24hrs, this kills the dust mites and eggs but not the allergens, we then defrost his bedding and put them on a hot 60c wash as this kills the allergens and we tumble dry them on the hottest heat as again this kills residual mites/allergens.
We have 2 sets of full bedding so one is always in the freezer, we normally need to replace a set every 3-4 months due to wear and tear.
For his bedroom
We UV light his bedroom after every deep clean and when he is at school/training etc (leave the UV light unit on) he also has a good quality air purifier unit on 24/7.
We deep clean every inch of his bedroom every week (ceiling,floor's, walls, furniture, radiators, skirting etc) and we thoroughly surface clean every day and hot wash floors everyday.
In his room we don’t have any teddies/ carpets/rugs/fabric furnishings etc… his furniture is all wood/metal and leather as dust and eggs cannot settle, we still have to deep clean and surface clean these to rid of any surface allergens however.
For the rest of the house
We do the deep clean the rest of the house fortnightly and surface clean everyday and hot wash the floors everyday.
We have minimised our soft furnishings as much as we can throughout ou home, so we don’t have carpets and have wooden flooring, our rugs are washable ruggables and our settee and armchairs are leather, our furniture is wooden etc…
Ds is 15, he was diagnosed with multiple allergies age 5 months , he still has to take a high volumes of hypo allergy medication a day (including carrying Epi-pens) he’s currently taking a daily dose of 70mg (average person takes 5/10mg) however this can go up to as much as 120mg as he is also anaphylaxis to grass and pollen.
To make your home a safe environment you need to be very strict in your cleaning and maintenance routine, it’s hard work but its our way of life now and to keep ds healthy and safe.