Basquash!

Episode 2
An unknown grey-haired girl with tanned skin bathes. 

Episode 9
Rouge (pink hair) bathes with a dark-skinned girl with black hair, a girl with blonde hair, a girl with purple hair, and possibly a girl with long white hair. 

Episode 10
Rouge bathes alone. 

Episode 17
The girl with purple hair bathes with the grey-haired tan girl. 

Episode 18
The grey-haired tan girl bathes herself. 

Episode 21
The purple-haired girl takes a shower while the blonde girl is drying her hair. 

Episode 23
Rouge bathes with purple-haired girl and blonde haired girl (this time in pigtails) 

Merchandise
Dark-skinned girl with black hair bathes with blonde-haired girl who's slightly tanned now.