I was at Winona under Bishop Williamson. One of the funny points in the story was about showering once a week. That's actually in the SSPX rule for seminarians. So I dutifully obeyed, much to my extreme discomfort. I would often wash my hair in the little sink we had in our rooms because I really couldn't deal with having greasy hair for a week.
Then after a few months of this, Bishop Williamson had gotten wind of this practice among the seminarians who were trying to diligently observe the rule, and mentioned it in one of his daily talks. He said that the spirit behind the rule was that seminarians had to take a shower AT LEAST once a week, not that they could shower ONLY once a week. At that point, I didn't know whether to laugh or to cry. Needless to say, I started showering every day. Bishop Williamson said that this was because of the French who didn't feel the need to shower for months on end. So the rule was "Seminarians should shower once a week." Ambiguous on the surface. To the American mind, this could ONLY mean that we had to limit showering to once a week because we simply took it for granted that we would shower at least that often.