to dry things heat is less important, you need a high volume of lower humidity air. If it's damp for 3 days that's a sure sign that you have microbes on it and it isn't drying.
Wash again with soap or vinegar; if you want, you may also want to use some bleach in your washing.
To dry you need to place the thing where it gets a high volume of airflow. Outside in the sun is a good option.
If you have like an always-on computer, you can put it near the fan that's always blowing or a spot near a refrigerator or water heater or boiler that moves air that might be another option.
Alternatively if you have something that stays warm, like a dvr box this can work as a passive air flow source that keeps the air rising and moving.