How to get your dirty whites clean again... HOT HOT HOT water, 1 cap of laundry detergent, 1 cup powdered dish washer detergent, 1 cup bleach, 1/2 cup borax. Tell you what, you have to rewash it once to put softener in but it's the whitest you'll ever see your whites. If you omit the bleach it works great to get stains out of colors too (baby spit up is no longer a stain on OLD clothes)
Best Way to clean your tub. Period. Make a paste of Borax for that grimy tub and tile or try swimming pool tile cleaner. For soap scum and water spots on glass doors, use equal parts of hot vinegar and Dawn dish soap in spray bottle. Just spray it on, scrub, rinse and be amazed. Allow it to sit overnight for stubborn stains and scrub with a dryer sheet or magic eraser.