cleaning very dirty demijohns

[Jonny69]

Y is that bad its very tough , and strong enough to take boiling water , ps I'm a chemist as well .

Careful with newer demijohns, they're thin compared with old ones and it's quite common for them to smash if you pour hot water in them when cold.

 

[Badger]

I've a few demis soaking at the moment myself and they're proving a nightmare to shift! Will try some of this cheers!