There are some household stains that, despite all cleaning efforts, will stubbornly remain, giving the impression that a surface is dirty, even when it’s not. Hard water stains definitely qualify as some of the most relentless, but according to the people who have tried it, this one reasonably priced spray is making all these difficult stains literally “melt away” before the very eyes of the people who have tried it.Hard water stains, which are typically caused by a heavy concentration of minerals in your specific region’s water, can cause dirty-looking patches on the insides of toilet bowls, make glass shower walls appear opaque and foggy and make showerheads and faucets look ancient. And to make things even more challenging, these stains are often resistant to scrubbing and even products like bleach. The Lime-A-Way spray, on the other hand, works by dissolving stubborn limescale and mineral deposits on surfaces, without scrubbing.“I was tired of scrubbing with cheap cleaners and the tub still looked filthy. This made the soap scum buildup literally melt away,” one Amazon reviewer insisted. Another Amazon customer who had tried everything to turn their grimy and opaque glass shower door back to its former clear and shiny self said that they finally used Lime-A-Way at the suggestion of their maintenance person. “Followed the instructions thoroughly, sprayed on and wiped off all the water stains and grime right before my eyes,” they claimed. Effective against lime, calcium, and rust stains, Lime-A-Way can also be effective on blemishes left on the siding of houses or windows, as one reviewer did with much success and without any scrubbing. “The unfiltered well water turned our house orange,” they wrote. “This literally only took one spray of lime away to remove the stains. Its speed is unbelievable and it’s incredibly effective.” They even attached a video of the stain-removing magic in real-time, which is one of the most convincing pieces of footage I’ve ever seen for a product.And who hasn’t been plagued by a shower head that has such significant buildup around the spouts that it impacts the water flow and makes it look dirty and decrepit?“After just a few squirts of Lime-A-Way and a couple hours of waiting, all I had to do was wipe it off. My showerhead looks brand new! Darn it, I wish I had known about this 20 years ago,” an Amazon shopper writes.Compatible with most surfaces and fixtures, except marble and natural stone, people claim to be stocking up on this talented cleaner because they simply don’t want to be without it. It’s a good thing then that a convenient two-pack is available at Amazon for $14, or you can purchase one bottle at Target for $7.Promising Amazon reviews:″I have extremely hard water, and my shower doors looked almost frosted with hard water stains. Nothing seemed to work well. I tried so many products without success. Then I tried this. I couldn’t believe it. It not only worked, but it was quick and easy! No elbow grease, no scrubbing, just spray and wipe. Then I rinsed it all off. My glass looks a thousand times better! A HUGE improvement. My white glass is now clean and transparent again. I am so happy. And the scent was fine, no worse than any other bathroom cleaner. It wasn’t harsh on my skin. I am tough skinned, but I had no problems cleaning without gloves. I am thrilled. I highly recommend. It also shipped quickly. I am going to stock up on this stuff because I never want to be without it.” — Joni“I was tired of scrubbing with cheap cleaners and the tub still looked filthy. This made the soap scum buildup literally melt away. Wear gloves. Worth every penny.” — Yalith“I was really skeptical when my mother recommended this product. I had that stubborn white, scaly buildup on my showerhead that nothing would remove, not even CLR or Bar Keepers Friend. I scrubbed and scrubbed with no luck. But after just a few squirts of Lime-A-Way and a couple hours of waiting, all I had to do was wipe it off. My showerhead looks brand new! Darn it, I wish I had known about this 20 years ago. Highly recommend!” — sharon“I was so impressed with this that I forgot to post before and after pics. Our shower glass door was almost white and super opaque. I tried every single home remedy for it including vinegar, baking soda and dish soap and NOTHING worked. Not even bleach. Our maintenance guy told us to buy this and holy wow it worked! Followed the instructions thoroughly, sprayed on and wiped off all the water stains and grime right before my eyes. Absolutely amazing 10/10.” — Rachel A.“Disbelief, Job well done! Years of hard water removed in less than five minutes on this fixer upper. Amazing product!” — JrIf you want to shop for more effective shower cleaners, take a look at the list of products below, previously gathered by the HuffPost shopping team:A “wet it and forget it” shower sprayWith over 66,000 ratings on Amazon, this "wet it and forget it" shower cleaner is a well-loved weekly shower spray that keeps walls and glass doors scum-, mildew-, and stain-free without any scrubbing. It's formulated without bleach or ammonia, so there are no harsh fumes or chemicals, and the high-efficacy sprayer helps cover a larger surface area faster.A best-selling grout cleaner that easily gets rid of stainsTile grout is notoriously hard to clean, especially when it comes to mold buildup. This professional strength cleaner has well over 14,000 ratings on Amazon for its ability to lift stains from grout and tile, easily restoring surfaces to their original color. Just apply, then allow it to soak into the grout for about 10 minutes before scrubbing and rinsing.A dual-sided erasing sponge to tackle all messesThis erasing sponge by Scrub Daddy can be used to eliminate a wide variety of stains, scuffs and more from multiple surfaces. Activated by water, this dual sponge has an eraser side infused with scrubbing gems and an abrasive side for harder jobs: clean sinks, fixtures, tiles, walls and more without needing any products.