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On/off would do! Just make delicate 30C all the things. If you need sterilization, use a powder that does that.

30C is a bad choice for colors/dyed fabrics. Cold wash is important.

Never done cold and been OK, but anything I care enough I would take to a professional dry cleaner anyway.

...I wash everything on a 40*C program designed for cotton fabrics and have never had an issue with anything.

Even better, been complemented by a family member recently that they have never seen a wool blanket be washed this well... lol