A rule, possibly referred to as the 30/30 rule, is being reported as a method to help reduce clutter and save money. The specifics of the rule are not entirely clear, with some outlets referencing a 30-day timeframe, while another mentions a 90/90 decluttering rule. The rule, associated with minimalism, appears to have had a positive impact on those who have tried it, helping to change their mindset and shopping habits.