Someone mentioned 2nd toothbrush for DC downstairs.
In a similar vein, I got into a habit of keeping a couple of clean cloths for cleaning bathrooms (we kept yellow jCloths for bathrooms, green/red/blue were all kitchen and general cleaning - but you can't get the colours anymore ðŸ˜) along with a bottle of cleaning spray and one of bleach in the upstairs bathroom. It was much easier to clean that when I had a spare 5 minutes, especially when it was hot and steamy after a shower, than thinking about it and having to go find all the bits...
Downstairs was generally bringing the same cloth down for the wash and grabbing the spray bottle and bleach kept downstairs beside the washing machine for general cleaning to do before I threw the cloth into the machine.