You've tried hot water, vinegar, leaving the door open.
The smell keeps coming back.
Here's why:
Pet hair + detergent = biofilm that traps bacteria. That bacteria makes your laundry smell.
Vinegar can't dissolve it. Bleach can't remove it.
You're fighting a buildup problem.
fello™ dissolves the biofilm, breaks down pet hair, and kills odor-causing bacteria.