Salty Thumb wrote:

...I don't understand ... i was just thinking of sterlizing pots (without
soil) during the end of summer for use during winter for seed starting...



Place your pots and trays into a barrel of water into which you have put
bleach to form a 1-3% solution (1-2 quarts of bleach in a 20 gallon
barrel). This will sterilize the pots. It only takes a few minutes to
get the liquid to soak through dried soil deposits. Wear rubber gloves.
Bleach on your hands can be neutralized with a dilute vinegar solution.

Remove the pots and place them in your greenhouse/coldframe with the
ventilation open. This will dry them out. Place them into a garbage bag
for storage to keep out spiders.

Trying to sterilize plastic with high temperatures is tricky. A closed
coldframe/greenhouse can easily melt plastic even in cool weather.

Leave the barrel of bleach open for a few days and the chlorine will
evaporate and you won't be putting chlorine into the groundwater.