I apologize if this question should go in the furniture section but since this pertains to outdoor furniture, I hope it's okay here. After storing our teak furniture outdoors (under a cover) over the winter, we were horrified to find yesterday that there were mildew stains all over our table and chairs. I'm not sure if the furniture is finished (I think it might have an oil on it)... What can I use to remove these awful unsightly stains?? Any help would be greatly appreciated!:o