A reader writes: “I have major lime and water deposits in and on shower rails. I’ve tried hydrogen peroxide and different commercial products. What do you recommend?” For tough jobs, such as lime deposits in showers, try AFM Super Clean Concentrated All-Purpose Cleaner/Degreaser, free of ammonia and chlorine. Note, It should be diluted first: AFM advises one part cleaner to one part water for heavy jobs such as lime deposits, and rinsing well after using on metal. Weaker solutions are sufficient for different jobs, such as routine cleaning of countertops, porcelain or metal. $6.95/ quart at http://www.phoenix.organics.com/ . For shower heads clogged by mineral deposits, remove and immerse in warm white vinegar; let soak for 4-5 hours, then scrub with an old toothbrush. Other quick, least-toxic scrubs include plain old baking soda, chlorine-free Bon Ami scouring powder (a mere $1.29 at drug and grocery stores), or cream cleansers by Earth Friendly, http://www.ecos.com/ , Ecover , http://www.ecover.com/ , and Seventh Generation, http://www.seventhgeneration.com/ . In a pinch, squeeze that toothpaste tube! Toothpaste works pretty well as a cream cleanser and metal polish. Recently, when guests were arriving and I’d run out of cleaning stuff, I used Colgate to clean and buff the scummy, tarnished fixtures on my bathroom sink. When using any cleaning product, including greener ones, do wear gloves, keep away from eyes, and ventilate well, as even plant-based ingredients can give off irritating fumes. Store well out of reach of pets and children. Please forward this blog to any interested friends, and send them to http://www.greenerpenny.com/.