If you leave your house during the day and the smell stays with you, then the odor must not be in your immediate home environment. Nasal irrigation seems like a good way to go.
I like to clean my nasal pillows with gently scented liquid soap, so that when I put them on at night I enjoy a light scent when starting my CPAP machine. When I take them off in the morning I notice the same smells in my house I always do, maybe a little more intense than otherwise because I didn't smell them at all during the night.
Mild Sleep Apnea- AHI 10.4-85% untreated oxygen sat.
Respironics M-Pro w/humidifier Pressure setting: 10
Optilife Nasal Cushions and head gear