Cleaning Methods
Is It Okay to Use a Pressure Washer on a Gravestone?
Quick answer
No — pressure washers are one of the most common causes of accidental headstone damage. The high-force water can drive into hairline cracks and force them wider, erode softer stone like marble and sandstone, and dislodge loose fragments or old repairs on aging monuments. Gentle hand cleaning is the safer standard.
Why pressure feels effective but often isn't
A pressure washer can strip away surface dirt fast, which is exactly why it seems like the right tool. But headstones aren't a driveway or a deck — many have existing hairline cracks, old repairs, or naturally porous surfaces that aren't visible until pressurized water finds them. Once water is forced into a crack, freeze-thaw cycles in colder months can widen it considerably over a single winter.
Which stones are most at risk
Older markers, and softer materials like marble and sandstone, are the most vulnerable. These stones erode more easily than dense granite, and pressure washing can visibly round off carved lettering and decorative edges that were once sharp — damage that can't be reversed.
What to use instead
A garden hose or bucket of water at normal pressure, combined with a soft brush and patience, cleans just as effectively over a slightly longer process — without the risk. For biological staining, letting a gentle cleaner dwell before rinsing does more of the work than water pressure ever could.
Sacred Stone never uses pressure washers — every visit uses hand cleaning suited to the specific stone.
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