I am a big fan of Colloidal Silver.
Gargling it and pouring a little up my nose seems to knock down a cold a day or two sooner than it would have without it.
Anecdotal, I know.
It works best when we use it IMMEDIATELY at the first hint and following hints of an 'illness kind of tickle' in our noses.
Salt water rinse--we'd have to use a whole squeeze bottle every 2-4 hours.
The silver only takes 2-5 squirts every 8-12 hours and is much more pleasant than the saline. And the removal of the illness is much quicker--usually 1-3 days for the silver vs 3-5 days for the saline.
Housemate had a kind of 'ice cream headache' pain for 5-15 seconds when he first started using the silver in his nose but now he doesn't have that sensation--usually. Someone said it was because of the Ph difference.