DAE clean their toilet brush??

I just found out my partner cleans the toilet brush every two to four weeks. I am so incredibly weirded out by this, I never even thought of this. I just buy a new one from time to time. Never heard of someone cleaning the toilet brush. Please help me

EDIT:

Thank your for all the replies, I laughed a lot while reading them with my partner. She clarified that she fills the brush container with bleach and hot water and doesn‘t wash it in the sink or something like this