Customers frequently ask how to clean and care for a granite monument, and providing accurate guidance is part of good dealer service. Granite is one of the most durable and low-maintenance natural stones available, but incorrect cleaning methods can damage the polished surface or accelerate deterioration. Knowing what to recommend — and what to warn against — makes you a more trusted resource for the families your customers serve.
The safest cleaning method for polished granite is plain water and a soft cloth or brush. For most surface dirt, algae, and general grime, water alone applied with a soft-bristle brush and rinsed thoroughly is sufficient. This method is safe for both the polished surface and any sandblasted lettering. It will not damage the stone, bleach the surface, or introduce chemicals that could cause long-term issues.
For more persistent staining, mild dish soap (like Dawn) diluted in water is safe for granite. Apply the soapy water, scrub gently with a soft brush, and rinse thoroughly. The key is thorough rinsing — soap residue left on the stone attracts dirt and can leave a film on the polished surface. Avoid harsh detergents, abrasive scrubbers, or cleaners that contain acids.
Acids are specifically dangerous to monument granite. Vinegar, citric acid cleaners, lime-away type products, and muriatic acid can etch the polished surface of granite, permanently dulling the finish. This is an irreversible change — once the polish is etched, restoring it requires professional re-polishing with diamond abrasives. Never use any acid-containing product on a granite monument.
Bleach (sodium hypochlorite) is commonly used in diluted form (1 part bleach to 10 parts water) to kill algae, lichen, and moss growing on granite surfaces. It is effective for this purpose and does not damage the granite itself in diluted concentrations. However, it should be thoroughly rinsed after use, and should not be applied repeatedly in high concentrations. Biological growth on granite is normal and does not indicate a problem with the stone — it simply requires periodic cleaning.
For heavily soiled monuments, biological growth (lichen in particular can bond tightly to stone), or monuments that have lost their polish due to weathering or etching, professional monument restoration is the appropriate solution. Restoration services use professional-grade cleaning chemicals and re-polishing equipment to bring monuments back to near-original condition. Monument restoration companies operate throughout the Northeast and can address staining, biological growth, and surface etching that home cleaning cannot solve.
As a dealer, having a relationship with a restoration service and being able to refer families to one is a value-added service. Families appreciate knowing that their monument can be maintained and restored over time, and it reinforces the long-term value of their investment in quality granite.