While my own bedroom is a mess, I'm going to request that my roommates cut down on clutter in shared spaces.
Is there a reason why you are bringing this up now?
A change in our relationship is a contributing factor.
People are expected to clean up after themselves when they make a mess, especially in shared spaces. Roommates should have a set of rules about household chores in order to keep harmony in the living situation.
I think they need to clean up, but I'm just going to live my own way.
Roommates need to be considerate of each other and this includes keeping living areas clean. It's important that everyone does their part as this prevents resentment and annoyance towards each other.