Cleaning Headstones
How To Clean Marble, Granite and Concrete Headstones with Bio-Shield®
Headstones are frequently discoloured by algae, and lichens and the often remote locations can make cleaning difficult.
A single application of Bio-Shield to the headstone will kill and remove the algae and lichens - No wash down or scrubbing is required. If the Headstones are treated with Bio-Shield every 12 to 24 months, they will stay clean and protected from regrowth.
- Easy spray-on application - 1 coat is enough.
- No Water Blasting or Scrubbing
- Bio-Shield® protects from algae and lichen regrowth
Returned Services Association - National War Graves Restoration Project
Bio-Shield is proud to be supporting the National War Graves Restoration Project and the volunteer Remembrance Army.
The goal of the Remembrance Army is that every service grave in New Zealand is restored to the same as their comrades overseas, maintained to the same standards or better as the Commonwealth War Graves Commission.
Since the project started in 2019, the Volunteer Army have used Bio-Shield to clean and restore over 150,000 of the 200,000 war graves and monuments throughout New Zealand.
Join Up www.rsa.org.nz/nz-remembrance-army
Why choose Bio-Shield® for your DIY Headstone Cleaning
Bio-Shield® has been developed through 40 years of use in a demanding commercial environment and it works extremely well.
Bio-Shield® is a high quality product, and contains no bleach, salts, acids or phosphates, so it will not damage the gravestone.
The high concentration of active ingredients in Bio-Shield® when compared to other outdoor cleaners means it will cost less per diluted litre and cover more area at a lower cost.
I have used your product for removing lichen and moss from headstones and it works brilliantly. Recommend all monumental masons use your product.
Ian - Maiden Stone Ltd. March 2018
Bio-Shield Mixing Ratios - for Pressure Sprayer
| Clean Water | Bio-Shield Concentrate | Total of Diluted Bio-Shield |
|---|---|---|
| 1 Litre | 50 ml | 1.05 Litres |
| 10 Litres | 500 ml | 10.5 Litres |
| 15 Litres | 750 ml | 15.75 Litres |
| 20 Litres | 1 Litre | 21 Litres |
Application
Application is best done on an overcast day at any time of the year, or early morning and late afternoon in summer if a warm sunny day is forecast. This slows evaporation and speeds the treatment process.
Fill your sprayer with the premixed Bio-Shield® solution and pump it up to pressure.
Begin application to the top surface, working down in slow, even strokes ensuring saturation.
Aim for the surface to stay wet for 5 to 10 minutes after application.
On concrete plinths and lighter colored stone like marble there will be a distinctive orange brown color change. This is normal and will fade over 24 to 48 hours.
Maintenance
The treated surface may clean up over the next few months providing it is exposed to rainfall; however it would not be unusual for a very dirty surface to take up to 12 months to fully clean up.
The more rain the surface receives, the faster it will clean up.
It is best to reapply Bio-Shield® at the first signs of re-growth. Typically this will be every 2 to 3 years.
Once the surface is clean Bio-Shield® will give optimal results with regular applications. This will kill spores and prevent the build up of moss, algae and lichen growths.