WindowAlert UV Liquid Marker | Anti-Collision Bird Deterrent to Prevent Bird Strikes on Windows and Glass Doors | Protect Wild Birds Around Homes and Buildings

This is the only solution that I could find that people would not see. This takes a little practice to use, but when I didn't daub the UV "ink" perpendicular to the window, it worked fine. The dauber could be improved, as it's just a bingo ink dauber and we are definitely using this dauber on vertical surfaces! (Manufacturers, please think about this). The dots were so light that the house showed and sold even though I had removed the taut bird safety net and daubed the windows all over with this thing. Yes, you have to position it against a vertical window, but don't start by holding your dauber at a 90 degree angle to the window. You can feel the ink slogging inside, so start with the dauber at a 60 degree angle and move up to 90 kind a slow, and press the spongy part only as hard as you need to against the window. The ink can "slam" into the spongey thing inside if you don't slowly apply the sponge, and it flows out too much and drips. The design of the dauber could be improved. I can't wait until competitors make this cheaper, because it works as long as you apply dots close enough so birds don't think they can fly in between the dots (and into the window). There is a faint image of the dots, but unless you are looking at the *cleanliness* of your windows, you will not notice them. No one noticed ours. Not the realtors nor the house inspection guys.

I bought this liquid, along with the reflective butterfly decals after a dove flew into my window and died. This stuff was easy to apply, and you can't see it from the inside. The first day, we didn't have any bird strikes, and I was hoping they could see it and would stay away. Unfortunately the very next day, a mourning dove flew full force into our window and died. I felt terrible about it. It's a nice enough concept, but it doesn't work to keep the birds away from the window. I ended up hanging wind spinners and a wind chime from the top of our patio, and the movement has worked to keep the birds away.

You can see from the photo that we have an enormous expanse of windows - and we have suffered from bird strikes after we cleaned our windows. This past spring during quarantine, we realized we were having non-lethal strikes once or several times every day, and lethal strikes every other week, terribly sad all around. I was struggling with what to do- I did not want to put glitter stickers or some other tacky option over the nice windows and disrupt the view and aesthetic, but I couldn't keep hearing a bird smash into our window and having to go over to see if it had a broken neck or not. I tried this UV liquid, and tried something that is not on the bottle's instructions. Instead of putting polka dots all over my windows, I instead painted the liquid over the window frames. I hoped that by outlining the glass panes with the bright UV reflection, it would look different enough to them that they wouldn't fly right into the window. It dries clear, you can't tell where I put it- I do have grey paint on my window frames. I waited 3 weeks after painting the window frames to write my review: It Works! I have had no strikes in 21 days. We are still home all day, and my wife has commented on the well it is helping. If you have birds hitting your windows-It is worth a shot. Its not too expensive- it has to be redone every few months so be prepared for that, but it doesn't take long. I have been very happy that I can have my windows and keep the birds safe. Will use from now on.

Definitely works, birds stopped crashing into the windows completely but it’s not invisible to humans. When dried you can still see where it was applied, so I eventually switched to stickers. If semi-transparent is good enough for you, it was easy to use and reapply every few months

I brought this product to use on the windows that birds seem to bump into. When I got it I learned that it is best used along with decals and not alone. Also it is best used on the outside of windows as it is toxic. Not as convenient as I thought.

Barely visible ti the human eye but visible outside and there was immediate stop in bird collisions, Cheaper than collision tape although will wear off and have to be reapplied. My concerns about appearance were unfounded. Great temporary solution

Updated 11/2024 - it’s been over a year and several cleanings but you can still see dot residue on the windows. There’s no UV reflection left but it’s almost like this stuff burned itself into my glass. Really hate that I decided to use this and that I ended up with dots that serve no purpose now permanently on my windows. So these work if placed properly. The first application, I applied randomly like the photo but that didn’t stop collisions. I also didn’t realize how quickly the UV wore off especially when exposed to rain and sun. Once I put them on in a uniform pattern, closer together, it pretty much stopped all collisions except if a bird would be randomly startled. If you are diligent about placement and reapplying, it does its job. Also, the farther you place dots, the more likely a bird thinks it can fit through the space between the dots - so the closer the dots, the number of collisions should decrease. This DOES NOT stop territorial aggression. Some reviews talk about birds coming up to the window and pecking at the window. That is not a collision. This product works for collisions, and does not make the window reflection completely invisible to birds. You have to get special products for territorial aggression (screens do usually work to stop that).

We have many windows on our covered porch, and birds make it a point to run beak-first into the glass. I was skeptical that using this bingo-like marker would accomplish anything, but it worked great immediately. The key is to make sure and space the dots close together. I placed dots within 2" of another dot. The UV dots do not obstruct my views. I can see them, but they are much better than using more obstructive stickers. I have had no bird strikes since covering my windows with the dots. Note -- when you wash your windows, you will need to reapply the dots. I am fine with that.

À recommander pour les vitrines cela évite de tuer les oiseaux surtout avec les nouvelles normes du gouvernement pour les piscines qui obligent une clôture de verre entourant celle-ci. En une semaine j'ai dû enterrer 14 oiseaux ce qui fait de cette clôture un élément de tuerie. Depuis que j'ai mis de liquide UV et rajouter des graminés cela a été instatané car les oiseaux voient des petits cercles mauve et remontent plus haut pour les évités. Je recommande ce liquide très fortement et même pour les maisons. Francine T.

J’ai fait des petits points un peu partout dans mes fenêtres. Ce n’est pas tout à fait translucide. Test encore en cours

This stuff works well and is easy to apply. I'm disappointed it 'expired' so quickly. I am still using the expired product.... it doesn't seem to be as reflective as when it was fresh. Save the birds!!

On voit toutes les traces dans la fenêtre. Pas très beau. J’ai bien suivi les instructions

I've been using this for two years now. I actually put it around the window frame which is white on our house. Once I do this the strikes stop for a few days. But, if there is a lot of rain since the time of putting it on I'll need to reapply. Sometimes this means I need to reapply each week up to a month. The smell is strong and the bottle isn't that big. I don't get that many applications before running out.