Clean off the maggots using a riddle to remove any dust.
Pour your cleaned-off maggots into a clean bait tub
Add cold water until there’s at least about an inch of it in the bottom
Now pour in hot water or tea/coffee from a flask GRADUALLY
A few of the dead maggots will float, remove these (they can be kept for the hook).
Now drain off the water using your riddle.
Superb dead maggots that have not stretched or lost their colour