Showers and bathtubs are the best way to fulfil your Sims' Hygiene mood. More expensive tubs and showers means taking less time for your Sims to get clean, as well as providing extra Comfort and a boost to the Environment score.
Showers are generally a faster way for Sims to get clean, but bathtubs also provide Comfort.
Toddlers cannot be washed in a shower. They can only be bathed in tubs and must be bathed by a teen or older Sim.
When Sloppy Sims take a shower, they can also satisfy their Bladder needs.
Bubble baths takes longer to replenish Hygiene but provides more Comfort.
Bathtubs and showers become dirty over time, requiring them to be cleaned. This interaction is only available when they are visibly dirty, and like all cleaning interactions, this increases the Cleaning skill.
Showers and tubs break over time, requiring them to be fixed. Doing this increases the Mechanical skill.