Haven't seen any signs of leaks Been looking at older coaches and some of them are just musty smelling. Can these be cleaned up or is the smell so deep its there forever? Is it usually in rug...
Professional carpet and upholstery cleaning. Truckmount only with steam. Also painting will remove a lot of odors.
Cig smoke will be really tough, but you can get it out with a good professional carpet cleaning at toss all furniture, pillows, etc., as it will be in the inner cushion fibers. Be sure to also have curtains cleaned. You will still have a slight smell every now and then.