at night i take a Q-tip and line my lower eye lash with milk of magnesia and this seems to calm the swelling/redness by morning. my oc rosacea is mild tho'--perhaps because of all the precautions i take (diet/no makeup, etc).
milk of magnesia may somehow kill demodex, though there's scant info per my research to support this, but a few sites.
it's one of the few things that calms my skin flares as well--i spot treat. it's very drying yet soothing. hope this helps someone.