“What’s this? My suit’s stained! I can’t go out like this! What will people think?” It’s the worst kind of betrayal; the Doctor's used to his clothes being clean and they’re anything but.
The TARDIS makes no response; silently she waits. She’s sentient, organic technology, and she cares for him to the best of her ability. That includes the laundry; sonics are very effective for cleaning fabric, the dirt just falls away to be sucked up and vented. Just hang clothes in any of her closets and when they’re needed they’ll be clean.
But not until the Doctor cleans her!