I prefer to bake mine at 200 - 250 for 40 minutes to an hour, to speed drying, not give nasties a time to grow. You have to pop off any plastic caps, remove any interior silicone orings, before baking -- they should pop off easily with a fork or nail after soaking in hot water (hold them with a paper towel, since they'll still be hot). Then they just go on a paper towel in the oven. Much higher than 250 may shrivel the carto outer covering.
Silly to do for just a couple, but a batch of 15 or 20 isn't bad. I remove caps, alcohol soak, rinse, then bake.