<p><b>Concrete Rust Remover Safely and Easily Removes Rust on Concrete, Stone and Masonry</b></p> <p>The most common question that we get about this product is "does it really work?" The answer is yes. We looked a long time and finally found a rust remover that would work effectively on concrete and still be safe to use. It's not hazardous and will not harm grass or vegetation when used on driveways and sidewalks. It's ideal for rust stains, fertilizer stains and battery acid stains on basement or garage floors, walkways, driveways, stone or concrete walls, steps, bridges, paver blocks and more. It can simply be rinsed off with plain water. Biodegradable. Contains no phosphates. The powder, when mixed as directed forms a gel that works well on vertical surfaces also. This 30 oz. powder concentrate covers approximately 60 square feet.</p> <p><b>Directions:</b><br></p> <ol> <li>Clean dirt from the surface to be treated.</li> <li>Add Concrete Rust Remover powder concentrate to warm water as directed on the label. (30 oz. container mixes with one gallon of water, but smaller batches can be made at a ratio of three tablespoons of powder per cup of water. As with any product, we recommend testing it in a small area first.)</li> <li>Stir until a clear liquid gel is formed.</li> <li>Spread generously on rust stain with a paint brush or scrub brush.</li> <li>Let stand 15 minutes or longer, depending on the severity of the stain. Simply wash away with water when complete. Repeat if necessary and apply a brushing action, if necessary.<br><br><strong>NOTE:</strong> Only mix as much as needed. After mixing, the rust remover loses rust removing ability over time. About half its strength is depleted in four hours.</li> </ol> <p>Shipping Weight 2.7 lbs.</p> <p style="background-color: #eee; padding: .75rem; width: max-content;"><strong>How Much Do I Need?</strong><br>Square Feet: <input size="7" maxlength="6" id="sqFeet" type="text" onkeyup="var i = parseInt(this.value, 10); var c = document.getElementById('numContainers'); if (isNaN(i)) { c.innerHTML = '0'; } else { c.innerHTML = Math.ceil(i / 60); }" text="">   # of Containers Needed: <span id="numContainers">0</span></p> <p><a href="/blogs/articles/concrete-rust-removal-faq">Get answers to frequently asked questions about our Concrete Rust Remover.</a><a href="/pages/concrete-rust-removal-faq"></a></p> <p><b>For very large areas we recommend the <a href="/collections/concrete-rust-removers/products/concrete-rust-remover-drum">60 lb. Concrete Rust Remover Drum.</a></b></p>