Some pint glasses designed for lager are made with nucleation sites for the bubbles at the bottom, over time these wear out and make your pint of lager look 'dead' compared to a fresh glass. This is less of an issue with ales and other less carbonated drinks though.
back
2 comments
My experience is either the wrong soap or unclean water leaves a residue on the glass killing any beer. It likely also fills these nucleation sites.
> Some pint glasses designed for lager are made with nucleation sites
They really shouldn't be, forcing CO2 out of suspension is exactly what you don't want. It causes the beer to become flat more quickly. This is why good beer bars use a glass washer right before serving, to remove any small particles that may end up in the glass and cause nucleation.
More quickly, like how quickly? Most pints are drunk within about 45 mins of pouring
You'll notice a difference right away, because the escaping CO2 breaks the head on the beer, which is exactly the opposite of what you want on a pilsner. As for going flat, I'd have to root around on Brulosophy later I think they did a test on this.