Re: sterilizing FF culture cups
Jeez. So much rigamarole here.
Dump the cup out in your compost bin or trash.
Wash in the sink with the disposal on. Use your hand to get the gunk out. It’s mildly gross but utterly harmless and you’re washable. Don’t be a wuss.
Fill cup halfway with hot water. Place top on loosely. Microwave until the water boils. Dump it out.
Remake culture. You’re good to go.
This has worked for me perfectly for over a decade. Zero mites. I’ve been using the same 6 plastic cups and fabric vented lids for years and years and years.
Problems are inevitable. Problems are soluble.