Julia dishes the dirt

Julia went for a shower this morning. She kicked up the usual stink: I had a shower in February, why do I need another one now? I’m not dirty. This shower cap is too big. The water’s too cold. The water’s too hot. Close the door. Open the window.
Before hopping under the water she weighed herself, coming in at a svelte 22.5 kilograms.
After 30 seconds of standing near the streaming water and occasionally glancing at the soap (which at that time in the morning was good enough for me) she sauntered out and dried herself.
She then stepped back on the scales and said: “Still 225. I told you I wasn’t dirty.”