If you don't blow yourself and the immediate neighbourhood into near-earth orbit first.
Hum, now there's an idea. No virus out there?
But the comment about making poison … who cares, I don't think the intention is to drink it! But it's illegal and so a non-starter.
It's worth emphasising that the best protection against coronaviruses is soap or detergent - it's better than alcohol. These viruses are protected by a ball of fat and "degreasing" makes them fall apart. ...
I was counting on this (detergent disrupting cell/virus membranes) with memories of what the NZ border control did to my wax raincoat 'cos they didn't like the look of it and the UK had foot-and-mouth virus at the time (they sprayed my coat with 5% detergent and put it in a plastic bag, they did say "sorry" when handing it back). But looking this up recently suggests it needs a few minutes contact time to have a decent effect. Not really practical for a "hand sanitiser", although using detergent/soap to
clean (as opposed to sanitise) your hands is still the best if a bit inconvenient at times.
So I watched the video
@Drunkula posted. And went with that. Getting the BAC50 was no problem, nor glycerine, but the foaming dispensers have been snapped up although some might turn up end of next week? I think the "foaming" is just economy and no harm just spraying on the
diluted (0.1%) stuff.
Except! It has not been proven to be effective and probably isn't. But as some (who know?) say; it's better than nothing. eBay have taken down all "no alcohol" sanitiser adverts that claim to be effective against coronavirus. I'll have to make do with my tiny quantity of isopropyl alcohol (which is supposedly better than 60% ethanol, and 40% ethanol or vodka
is useless).
Starsan indeed contains a "detergent" (dodecylbenxenesulphonic acid, a anionic surfactant), which is important in making Starsan work. Benzalkonium chloride (in BAC50, a cationic surfactant) can have such modifiers added to make it more effective. The NHS foamy hand sanitisers have these? PS: don't mix BAC50 and Starsan 'cos BAC50 don't like it (prefers alkaline conditions).
WARNING: I'm no expert and have just disgorged "facts" I've come across to help people make their decisions. Do your research! Don't believe what I, or others, write without good reason to believe them.