Our beardie, Pedro, didn't like bathes at first. Same behavior, tried to climb out and scamper away. I resorted to holding him in my palm, while slowly pouring luke warm water over him. Twice a month he would get a
bath, sometimes more than that, but normally twice a month. He slowly started to trust the
bath time. I got a small 3gal rectangular tupperware type container, placed a flat rock inside, higher than the waterline so he could lay on it out of the water. He no longer scampers to get out of the tub. He gets a 1/2hr. of
bath time with constant cycling warm of water in so he doesn't get cold. I really think its a matter of trust, getting used to the concept of a
bath and trusting that he won't get in trouble or hurt. Just my observations!