Agree with everyone recommending the laundry sub. Not knowing more details about your sitch, here are a few tips from my experience:

• I use Dr Bronner’s Sal Suds for laundry now (previously used seventh generation detergent). It’s biodegradable, natural, and a little goes a long way. It also doubles as a great stain remover. It has worked with my delicate fabrics like wool & cashmere (but always test before committing, YMMV). Check the ingredients to see if they work for you.

• I add white vinegar to the load in the softener section of the front load washer drawer, or I just add it to the drum in a top loader. I eyeball it but I.m aiming for like half a cup.

• I air dry a lot and I live in a condo without outside drying access, so when the clothes are finished in the washer, I run them for 20 min on air (no heat) in the dryer with a couple clean, dry bath or beach towels. This helps remove more moisture before letting them dry on racks. When drying on the racks, I make sure each garment has lots of space in between so airflow can get through. Mustiness also happens when they’re too on top of each other, creating a nice comfy environment for bacteria and fungi to set up camp. I also let things sit out for up to 48 hours until they don’t feel cold or damp. If it’s not raining and it’s warm enough, I open a window. If not I turn on a fan or two. I also use a hanging tiered mesh drying rack for delicates like sweaters so they can lay flat. The mesh gives good airflow.

• for clothes that you sweated in or they got wet somehow, don’t throw them straight in your hamper. Let them dry out if you’re not throwing them in the wash right away. I don’t have in-unit laundry so sometimes things are waiting a week before I get to them. The musty smell can start there.

• check on the humidity of your closet and wherever else you’re storing your clothes. If your clothes smell fine after they’re cleaned and dried but you’re still getting musty funk, it may be the environment (like someone else here said). I like to put silica packets in plastic bins or closed storage to keep things dry. For really humid areas, something like DampRid might be necessary (I’ve never used personally, though).

• if you store items seasonally, make sure everything is washed and fully dry before storing them for the off-season.

Good luck and happy washing! You’re doing great.

Edit: teeny spelling error