Yes, CLO2 should be absorbed sublingually.
See this file for details.
You could add some DMSO, too.
However, if it is CLO2 that you want absorbed into your blood stream, you would want to use CDS or possibly CDH. CDS is 100% CLO2 in water while CDH is 50% CLO2 externally (not in stomach acid). MMS1 is only 10% CLO2 externally, although it may be fully activated in stomach acid. But, that won't happen unless you swallow MMS1, which you won't be doing.
Of course, ladies can take CLO2
vaginally.
And there is the Bag Protocol.
You could try ingesting liposomal Vitamin-C. That should pass through your stomach and into the small intestine where it would penetrate through the wall and into your blood stream. I have found that MMS does not work for me with colds/flu, but liposomal Vitamin-C does work. I take 1 gram twice a day and have not had a cold or flu since I started doing that, using home-made Lipo-C.