First, find out what the stains are. Iron staining? Stain from using Morton System Saver salt pellets? Algae? Your pool service man should be able to tell you. Then take the appropriate action to remove - ask your local pool shop or pool service person.
water
When boiled with water it usually turns yellowish to dark brown brown.
water
Westie beards should NEVER be brown, if it is that means the dog's white fur is badly stained. Sometimes reddish-brown "rust" stains can happenfrom minerals in their drinking water. If that happens start giving the Westie filtered water. (A Brita filter will do.) The rust stains will eventually grow out. If you want to remove the stains in the meantime, there are commercial products available, or see a dog groomer.
To remove coconut water stains, first soak with cold water for a small amount of time. Then, spray the stain with a stain treatment, then wash in cold water.
Oil and grease stains are tough to remove from clothes because they resist water. The water in a washing machine works around the stain. Detergent makes it possible to remove oil and grease stains.
Vinegar.
Pledge will remove water stains from wood as well as apply a protective layer to help keep new stains from forming.
i suppose your wa shing machine leaves stains as well
You can use a solution of two parts water to one part white vinegar to remove water stains from glassware.
Kaboom! Kaboom!
It is true that water alone cannot remove greasy stains from clothing. Alcohol usually can because it is a solvent.