Do You Rinse D/2 Off the Stone or Leave It On?

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I’ll never forget my first big headstone job, it was a 1920s marble marker in an old cemetary up near the foothills. I’d read all the forums, watched the videos, and I was so proud of myself for finally getting a bottle of D/2 Biological Solution. I sprayed it on, waited the recommended ten minutes, and then… I panicked. I didn’t know if I was supposed to rinse it off or just let it dry. I stood there, scrub brush in hand, staring at that wet stone like it was a test I hadn’t studied for. Took me three tries over two days to get it right. Worth it.

That confusion is way more common than you’d think. I hear it all the time from clients and fellow genealogists: "Do you rinse D/2 off the headstone, or do you just leave it?" It’s a simple question, but the answer matters alot for the long-term health of the stone. So let’s clear it up, once and for all.

The Short Answer: Yes, You Rinse It Off

Here’s the deal — D/2 is a biological solution that kills and removes lichen, moss, algae, and biological staining. It works by breaking down the organic matter. But if you leave it on to dry, that solution can leave a residue. And not just a little white haze. I’ve seen it turn into a crusty film that’s harder to remove than the original grime. Big mistake. So, always rinse with clean water after the dwell time. I use a spray bottle or a gentle garden hose nozzle — never a pressure washer. Just enough to wash away the solution and the loosened gunk.

How Long Should It Sit Before Rinsing?

This depends on how dirty the stone is and the wheather. For light biological growth, five to ten minutes is plenty. For thick, crusty lichen, I’ve let it sit for twenty minutes. But here’s the catch — don’t let it dry on the stone. If it’s a hot, sunny day, the solution can evaporate fast. I always work in the shade or early morning. And I keep a spray bottle of water handy to mist the stone if it starts drying out. If you’re in doubt, rinse sooner rather than later. You can always reapply.

What Happens If You Leave It On?

I learned this the hard way on a sandstone grave from 1875. I was in a hurry, it was getting dark, and I thought, 'Eh, it’ll dry clear.' It didn’t. Next morning, the stone had a chalky white film that looked worse than the moss I’d cleaned off. I had to scrub it with a soft nylon brush and rinse it three times to get it back to normal. That film isn’t just ugly — it can trap moisture and dirt, leading to more staining. Never again. Now I always rinse, even if it means carrying extra water from my car.

Tips for Rinsing Without Damaging the Stone

Use a gentle stream of water. A spray bottle works great for small stones. For larger ones, a garden hose with a spray nozzle set to a soft shower pattern is fine. Avoid pressure washers — they can blast away the stone’s surface, especially on soft marble or sandstone. And use clean water, not water from a puddle or pond. You don’t want to add new dirt. After rinsing, let the stone air dry. Don’t wipe it with a towel or rag — that can leave lint and smear the residue. Patience is a virtue here.

Frequently Asked Questions

Q: Do you rinse D/2 off headstone if it's granite?

A: Yes, even on granite. Granite is tougher than marble or sandstone, but D/2 residue can still leave a dull film. Rinsing makes sure a clean, natural finish. I always rinse regardless of stone type.

Q: Can I leave D/2 on overnight if the stone is really dirty?

A: Don’t do it. D/2 isn’t meant to sit for hours. It can dry out, form a crust, and even etch some stones if left too long. Stick to the label directions — 5 to 20 minutes max. For tough stains, reapply and scrub gently with a soft brush.

Q: What if I can’t rinse because there’s no water source nearby?

A: Bring your own water. I carry a 2-gallon garden sprayer filled with clean water. It’s enough for most headstones. If you’re in a remote cemetery, plan ahead. Leaving D/2 on is not a shortcut — it’ll cause more problems.

Q: Do I need to rinse after scrubbing with D/2?

A: Yes. Scrubbing helps loosen the biological growth, but you still need to rinse off the solution and the debris. I scrub, let it sit, then rinse. The rinse step is what removes the gunk and the chemical residue.

Q: Is it okay to use a pressure washer to rinse D/2 off?

A: No. Pressure washers are too harsh for most headstones, especially older or softer stone. Even a low-pressure setting can chip edges or erode the surface. Stick to a gentle spray or a soft brush rinse. Your stone will thank you.