> you don’t want to use that oven for food purposes anymore. Lots of toxic chemicals will off-gas in the reflow process.
Just run the oven at full heat for an hour and you are fine - the same process that off-gassed the chemicals in the first place, will also deplete them from the oven when you run it later. (Keep the vent on, or ventilate the kitchen.)
You can also stick a fume sucker[0] in the (cold) oven for a hour.
But with either approach, make sure nothing dripped and landed on the bottom of the oven chamber (or worse, the corner seams or the space under the chamber), since that can stick around and keep outgassing for months or years.
0: A length of dryer hose with a salvaged PC cooling fan on one end and the other out a window - usually used to ventilate solder fumes.
Just run the oven at full heat for an hour and you are fine - the same process that off-gassed the chemicals in the first place, will also deplete them from the oven when you run it later. (Keep the vent on, or ventilate the kitchen.)