Do you know that they (whoever that is) have done a study on sneezing and determined that people normally do so in some innate pattern. Some people sneeze only once per episode while other are two sneezeers and some even three sneezers. Me, I'm a two sneeze sneezer. I generally always sneeze twice per episode. Remember that, it'll be on the test.
Now, about that bad breath odor running backwards through your xpap hose - it doesn't work that way. That presumes you have the blower turned on - you do turn it on don't you? With the blower running, nothing much goes through that hose but the filtered air from the blower - you do have the filter installed don't you? BTW, I change the filter monthly since they're so cheap. Actually it's me that's cheap since I make my own filters out of HEPA air vent filter material I got from Lowe's.
That is not to say your breath can't stink so badly that it raunches out the whole bedroom and peels the paint from the walls, in which case you may want to try some mouthwash. And no, don't put it in the humidifier reservoir. If your breath is so bad it travels upwind, you have another problem in addition to apnea. I'm going to call it stinknea. You may want to wash the entire bedroom in addition to washing the inside of that hose since the same stuff is infecting it also.
But seriously, the major part of of any remaining particulate matter that gets by the HEPA filter on your cpap box (you do use a HEPA rated filter don't you) will ordinarily end up on the impeller of the blower. If you need to wash anything, it would be that but it's not accessible to mere mortals since tearing the box apart on a weekly basis would no doubt ruin it.
To each his/her own but I'll wash mine again when it get to where the air can't go through it easily or every few months, whichever comes first.
I also use Dawn for washing. I wash the tube, face mask and nose and forehead cushions in the sink. I have found the water chamber needs more. I put an inch or so if HOT water and more Dawn in it. Using the washing piece that seals the openings, it is vigorously shaken, then rinsed multiple times to get all the soap out. I then put a cup or so of vinegar in the water chamber, seal and shake. I let the straight vinegar stay in while I partially fill a pitcher with hot water, just enough to cover the water chamber, which I now submerge. I let it soak for 2-3 hours. I first do the water chamber and the nose and forehead cushions. The second "load" is the tube and face mask. When removed, I allow to dry before using. I then use the vinegar/water solution for my electric tooth brush, water bottles, etc. that may need cleaning.
My medical supplier was somewhat aghast when I told him how I cleaned (probably wanted to sell me his chemicals), but I told him I had been doing this weekly for over 12 years without problems. On occasion, it has been a week-and-a-half or two weeks between cleanings, also without problems, but I do my best to do it every Saturday.
This isn't about hose cleaning but some may find it useful nonetheless.
Long ago I was on a regimen of weekly cleaning my mask. Between the weekly cleanings, I used Pampers wipes to clean the cushion. I began to notice that I had problems with leaks on the night following the weekly cleaning. Being smart like I am (duh) I realized that a soap cleaned cushion didn't seal as well as one that was rubbed with a Pampers wipe. They have no chemicals but have a touch of aloe vera in them and apparently that leaves a coating on the cushion that is conducive to better sealing to my face. I dare say it may even give some relief to those who are allergic to the silicone of the seal, although I can't attest to that since silicone and I are friends.
Now following my weekly soapy cleaning I wipe the cushion with a Pampers as the last act after drying. It works well for me. YMMV