It is more healthy to be naked when using saunas and steam rooms. Many UK spas have a 'costume mandatory' policy whereas most other European countries enforce a ‘no costume’ rule at their spas, placing hygiene before prudery. Shower naked whenever possible and use soap; a quick rinse over a costume will achieve very little and won’t get rid of invisible faecal matter and bacteria. These pathogens mix with sweat under swim wear and then seep onto the benches of the sauna or steam room.
Spas and saunas provide an excellent and appropriate opportunity to try social nudity and change these attitudes. Nudity should be encouraged at spas, as one of the many places where clothing is not only un-necessary but is also less healthy.