removing a smell, can I spray anything through the machine?

I have a Resmed Airsense 10 machine. We have a camp in the mountains that is closed up all but probably 6 weeks a year. I run a dehumidifier up there all summer but we still get a closed up smell. After returning home I routinely soak my hose and my mask parts is white vinegar and water. I then run a cleaning brush through the hose and fill the tank with the vinegar and water solution. I shake it and then give it a good cleaning and rinse, I then replace my filter. After everything is dry, I hook everything back up and start the machine with my thumb over the discharge hose hole to create backpressure, otherwise the machine shuts down on major leak alarm. I do this to flush fresh air through the machine but at the end of all of this, I still have a smell in my machine. That smell will be pretty intense for the first little while, then it becomes bearable. The next day I can still smell the smell, but its beginning to fade.

Is there any kind of a freshener that I could spray in the intake to deodorize the machine? The machine itself is the only part that isn't getting cleaned with vinegar and water and I've get to think that is what is holding the smell. I saw a previous 2018 posting where someone was suggesting spraying ozium, a car odor eliminator into the machine. Has anyone tried this? Obviously there is a pressure sensor in the machine, I wouldn't want to use anything that could harm that.

Just run it all day at an open window with fresh air running through it.

To allow the machine to run/blow air continually try this..
Turn off SmartStart if you have it turned on.
Attach any hose to your machine.
Then push the on button and the machine should blow air continually and you won't have to put your thumb over anything.
The trick is attaching the hose and turning off SmartStart.

I don't advise spraying anything into the insides of the machine. There is a motor in there and sensors and we just don't know how protected they might be from whatever you would introduce.
What I would do, if it were me, is just place something good smelling on a cotton ball and place it at the intake air hole and let the good smelling stuff get run through the machine for a while.
I like essential oils...so I routinely will put some good smelling essential oils on a cotton ball and let that aroma come through the machine.

Also allowing the machine to just blow air while outside in the fresh air for a couple of hours might work well.

You can trick the machine into just blowing air for as long as you want ....I know because I have done it.