This tip is ideal for refrigerators with ice makers. It would be a shame to have a dirty ice makers. Just remember to not use harsh cleaners for this, you can use steam to clean them instead.
This is a common problem in every household. You can solve this problem by just using Clorox toilet bowl cleaner with bleach. Scrub it a little and let it stay for about 10 minutes.
Do you have a microfiber couch at home? You may not know that hard water can cause the dark edges to circle to appear. Try soaking the top layer and rubbing with a cloth to clean it.