Xavi is a fleshy cat thing but she's also a witch and infamously lazy so it would be very cute and on-brand for her to not want to bother with taking a shower. Just pour some soap into the washing machine, set the cycle, TF herself into a plushie, and toss herself in.
And then climb out, sopping wet, and fling herself into the dryer with a wet plomp.
Come back out, TF herself back into a normal cat, and now she's fresh and clean and smells like lilac... And her clothes even got cleaned too, as a bonus! ^w^