As one who is extremely allergic to molds, I am very aware of the problem. Spraying Febreez, using scents or using coffee grounds doesn't do much except replace one odor with another. The cause, which is mold or mildew, is still present. I would suggest a weak solution of any basic household disinfectant that has the compound dimethyl benzyl ammonium chloride (you might see it listed as any compound C12 through C18); these are better than bleach because they penetrate deeper into porous materials and will actually kill the mold. You need to first check the effect on the lining. I would follow that with exposure to direct sunlight. Once the mold is killed, I believe that the use of zeolite available as granules or small pieces at your pet store may help to absorb residual odor.
