Take out all of your lingerie girlie girls, and fill up the sink with cool water, and some delicates washing soap ( the best you have ) and spend an hour carefully washing and examining every inch of your panties, bras, stockings, camisoles, nighties, slips, and all your other pretty things.
Make sure you watch for any loose threads or seams that need mending, or any hard to remove stains ( naughty girl! ), and do what is needed to care for your delicate feminine underwear.
Sissies must learn to wash and care for their laundry, as well as their Mistress's laundry. I expect you to do your very very sissy best!