D/2 Biological Solution - 1 Gallon

Will this work on a mildewed concrete patio or do you have to clean the mildew off first?

Yes, this will work very well to remove mildew from a concrete patio!

Living in Colorado, we have a lot of minerals in the water. The cemetery irrigates using sprinklers which when the water dries on the monuments there is a white deposit that builds up. Will D2 work on solving that problem. If not please suggest something.

Hello, we recommend trying the Sparks Brick & Tile Cleaner and CleanStone for this!

Does this remove rust from headstones? Our cemetery has so much mineral in the water the headstones look orange with rust.

D/2 Biological Solution works to remove mold, mildew, moss, algae and air pollutants. Unfortunately, it will not work well to remove rust stains. We recommend trying Pre-Lim Surface Cleaner or Rust Remover

would it be safe to use D2 on the interior/exterior of a nylon tent that's covered with mildew?

Yes. We don't know of any official testing on nylon, however it should work and remove the mold. Make sure that you thoroughly rinse the tent after application.

Is this safe on white quartz?

Yes! D/2 is safe to use on all hard surfaces

does this item come with a the 1 qt. spray bottle?

No, the quart size with spray nozzle is sold separate. The D/2 Gallon is just the gallon sized container of solution.

I have 15 S.F. of granite to clean at family cemetary - how much do I need? I see John at Brico in Glastonbury, CT from time to time.

Average coverage is 300 square feet per gallon so 1 quart of D/2 should be more than enough!
Click here to buy D/2 1 Quart

Is D2 safe to use on bronze?

Yes, D/2 is safe to use on bronze but it will not clean oxidation.

Is d-2 ok to use on shingle roofs?

Yes, D/2 is safe on all built structures and works well in most situations where biological growth is the issue.

If i use this product will damege the glass and a metal?

No, D/2 Biological Solution will not damage anything that it's used on.

Is cleaning with D/2 best followed by rinsing with water?

There are two primary cleaning methods when using D/2. 
1. Spray D/2 on and walk away. It will take longer but eventually the rain will naturally rinse away the staining, it could take a few months.
2. Spray D/2 on. Let it dwell on the surface for at least 15 minutes then scrub with soft bristle brushes and rinse with clean water. This method will give faster initial cleaning, but can still take up to a few months for the full effect.

What is the shelf life of D/2 one gallon unopened. Also D/2 one gallon opened. Thank you.

The shelf life on D/2 is 5 years, opened or unopened.

Is it safe for plants and grass?

Yes it is safe in environments with plants and animals.

Do we use the D/2 straight out of the gallon bottle or dilute it?

For long term or stubborn staining of biological growth it will be most effective undiluted. 
However for less aggressive biological staining, or if you're re-cleaning stones that were recently cleaned you can dilute up to 50% water.

Will D2 work on fiberglass boat without damaging it.

Yes, D/2 works well on fiberglass as well as wood, nylon, vinyl, canvas, etc. D/2 is Ph neutral and will never harm a surface. As with any new product, just to be safe, we recommend spot testing in a small inconspicuous area before full application.

I discovered that my great great grandmother's headstone had fallen over. The face of the headstone was facing down into the soil/ground. We were able to roll the stone over to see the front/face of the stone. The front is fairly muddy, but legible. We are going to have the stone reset and resealed. Should I wait to clean the face until this work is done? If so, should I spray the D2 on a fairly muddy surface, or first water off the dirt and then use the D2?

Thanks for reaching out! You can clean the stone before or after the repair, whichever you prefer! In this case I would recommend rinsing down with water and getting any dirt or staining off that you can before using the D/2!

Do you have to reapply the D/2 every so often or is it just a one-time application?

After application, the D/2 will do it's best work in the weeks and months to come. Results should last at least a couple of years before another application is necessary!