10 Best Mildew Cleaner For Marble 2026 in the United States

The ULTIMATE GROUT CLEANER by Black Diamond Stoneworks presents itself as a powerful, acid-free solution for deep cleaning grout on various surfaces, including marble. One of its standout features is its professional-strength formula, capable of tackling even the toughest grout stains in kitchens and bathrooms. This product is particularly safe for delicate surfaces, ensuring that it won't cause damage to colored grout or natural stones like marble and granite, which is crucial for maintaining the integrity of these materials. Additionally, it aims to restore the original color of grout, giving floors a refreshed appearance.

Versatility is another strong point, as it can be used effectively with a grout brush or a steam cleaning machine, catering to different cleaning preferences and needs. Made in the USA, this cleaner also emphasizes eco-conscious household care, adding a layer of reassurance regarding its quality and environmental impact. However, the product's effectiveness may vary based on the severity of the stains and the specific use case, so some users might find it less potent on particularly old or stubborn mildew.

Its large 4-gallon packaging, while economical, could be cumbersome for some users to handle or store. In terms of application, while it is generally straightforward, those unfamiliar with grout-cleaning processes might find the need to use additional tools a bit daunting. The scent is described as fresh, which could be a plus for those sensitive to strong chemical odors. This cleaner is a strong candidate for anyone looking to maintain the cleanliness and appearance of their marble surfaces while ensuring safety and effectiveness during the process.

The Black Diamond Stoneworks Limestone and Travertine Floor Cleaner is designed for natural stone surfaces including marble, making it a versatile choice not just for marble, but also for limestone, travertine, slate, and even polished concrete. One of its significant strengths is its pH-neutral formula, making it safe and gentle on marble and other sensitive stones. This cleaner is also biodegradable, which is a plus for those who are environmentally conscious.

Its concentrated form means you only need a small amount per gallon of water, making it an economical option over the long term. Additionally, the product's ability to enhance the natural beauty of the stone by brightening colors can add aesthetic value to your surfaces. However, it's worth noting that this cleaner's application method requires dilution, which might not be as convenient for some users compared to ready-to-use solutions.

Furthermore, while the product is generally effective, the effectiveness can vary depending on the severity of the mildew or grime present. At 36 pounds for the 4-gallon size, it is relatively heavy, which might be a consideration for ease of storage and handling. For those seeking a professional-grade, American-made cleaner that is eco-friendly and cost-effective, this product could be a good fit, especially if you are prepared for the extra step of dilution before use.

The DuPont Mold & Mildew Stain Remover for Natural Stone is a versatile cleaner designed for use on a variety of surfaces including marble, granite, limestone, and more. One of its strengths is its unique formula that does not degrade stone or grout, making it safe for marble. This is a crucial feature for those looking to maintain the integrity of their stone surfaces.

The product is easy to use with its spray application method, which simplifies the cleaning process and leaves behind a fresh, natural scent, enhancing the user's experience. Additionally, it can be used both indoors and outdoors, providing flexibility in its application across bathrooms, showers, countertops, and other areas prone to mildew and mold buildup.

With a volume of 24 fluid ounces, it offers a reasonable amount for multiple cleaning sessions. The DuPont Mold & Mildew Stain Remover is a reliable choice for those seeking a safe and effective cleaner for marble and other natural stones, although it may require persistence for tougher stains.