When the blue color is gone, it is time to drop in a new tablet,” one reviewer, Not Martha, ... See for yourself and nab a year’s worth of this trust toilet bowl cleaner while it’s under $13.

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Step 2. Reach for a professional strength acid gel cleaner like Zep Acidic Toilet Bowl Cleaner (Buy from Home Depot, $5.98).The gel is often strong enough to cut through even the toughest of stains.

Method 2 using citric acid is a nice option that works well for tougher stains, according to Stein. “It’s effective at ...

If automatic toilet bowl cleaner is turning water blue, a cross-connection in the plumbing can be the cause. If the water has been turned off, ...