I very rarely take a bath - once or twice a year at most, due to a desire to cut down on the amount of water the household uses and the amount of heating.
I shower every second or third day, as I no longer perspire as I used to pre-menopause. On the intervening days I strip wash.
I have never washed my hair more often than once a week, and now I am back to once a fortnight - but I have always had dry hair.
Having lived in flats that did not have baths until recently, I find cleaning a bath far more ardurous than clean the shower. I give the bathroom walls a quick wipe once a fortnight, clean the toilet and wash-basin thoroughly ever week, or whenever they seem to need it, and clean the entire bathroom thoroughly every three weeks.