Normal mildew I can handle with a bottle of diluted bleach. However this mildew is underneath the caulk at the edges of my tub. Are there any suggestions as to how I should treat this. Can I kill it without having to remove present grout? The house is on a slab with a crawl space and there is direct outside air and moisture in contact with the tub edges. Maybe some kind of sealer? I want to avoid crawling under the house. Please, advise.
