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Hairline cracks—tiny cracks in the surface—in porcelain sinks can happen due to age, chemical damage from cleaning products, dropping heavy objects on the sink, thermal shock from drastic temperature changes, stress during repairs, and manufacturing errors. Hairline cracks often start very small and grow longer and wider over time. While they may appear problematic, hairline cracks don’t indicate structural problems and may not impact the performance of sinks. However, they can eventually cause water leaks and mold growth if left to grow.

To prevent damage to stainless steel sinks and appliances, avoid harsh or abrasive products. Cleaners containing oxidizing chemicals like bleach, chlorine, and ammonia can cause rust. Additionally, abrasive items such as steel wool, metal pads, hard-wired brushes, and abrasive sponges can permanently scratch the surface. For safe cleaning, DIY solutions like vinegar and baking soda are generally effective.

Removing hard water stains by using baking soda, lemon juice, vinegar, or some combination of all three will give you a nice, even surface to work with. Then, you can use olive oil to give your steel a nice shine, wiping away the remainder with a soft cloth. Glass cleaners and other commercial products may also help, but always be sure to spot-test before using new products on your sink—stainless steel can be finicky.

Because it’s an engineered stone, quartz composite is much denser than other natural stone alternatives. For instance, if you drop a heavy object in a natural stone sink, there’s a chance the sink could crack, chip, or dent. Quartz’s density means quartz sinks are more resistant to scratches or staining. However, darker quartz sinks are more likely to show scratches or scuffs, and quartz sinks can stain over time.