Sounds like a plan. :) (Tag instructions usually found on delicate or non-colorfast clothing items)
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Cold - the machine heats the water as required (just as a washing machine does)
Set the temperature dial on cold and wash as usual.
Just wash it in the washing machine under cold water with no bleach!
Hot water will remove it more completely.
Generally, no. Germs are best killed by very warm or hot water.