Getting a stale musky odor out of a room? what can I do, after I vaccum it returns in a few...

what can I do, after I vaccum it returns in a few days.
What can I do, I do laundry once a week.
Like what can I do?
How can i verbs a microwave to be...
Answers:    1st, Ventilate for 48 hours,,,afterwards .buy, put together-simple 2 step Silica Moisture absorbers... and then close the door near Silica moisture absorbers..wait another 48+ hours...hold all moisture out of the room and spray entire room and walls near lysol..add/hang pillow case type heaps of cedar chips...wah lah!! Ciao to any yucko smells, dampness and any other pests..it works great!!
Please Help! I've get calligraphy ink on...
is your room all right ventilated? you may hold some mould or fungus growing there.