This may be caused by hard water buildup. To try to remove it, soak the glasses in warm vinegar and then scrub with a brush and wash. If you can't get the buildup off, the glasses could be etched (scratched), which cannot be removed.
Wash, fold and put away. Do not starch or use fabric softener because dampness in the storage area could react with the starch and create stains or even encourage mildew. Starch and iron later when you need to use them.
It may sound strange, but simply storing your bar soap unwrapped will give you more suds. The reason? Exposure to air dries out the soap, so it doesn't dissolve as quickly when it comes into contact with water. To get the benefit, unwrap any bars and let them dry out for at least a week