L.A.
Yep, they do this sometimes at this age. Our daughter "was tired of baths" and would do anything to squirm out of them.
We used to do bath races.. I would bathe her one night as fast as possible. and then the next night my husband would bathe her and try to beat my time..We kept the times on the bathroom mirror.
My husband would cheat and tell her to hold the shampoo and the soap (hee, hee). My husband was not as thorough as me (on purpose and our daughter would call him on it) she would yell out, "dad says he isn't going to wash my neck!!!!."
The rule is we had to wash her as well as we normally did.. No cheating..
Our daughter would laugh and laugh ..
Just try to think of other ways of doing things..
Maybe bubbles every once in a while. Shaving cream to write on the tub walls..
Wash her in the darkened bathroom, just the hall light..