Here is what Jenna Citzs says:I put this on the experiment on a large and colorful angle of my tank — i‘ve scrubbed and scrubed that area before, and I couldn’t simply remove the spots until I used these things. As you can see above, I wear gloves (which is proposed on the package) and Just apply a thin strip to the place where black spots are on, then sit for six hours. After that point, you just wash it to wash it and see the results! I didn’t need a second request, but if you deal with some strict spots, you can submit a request again.”
Contractor Review: “Woe! I’ll give these 10 stars if I can.. We were actually talking about tearing Kolking and a complete replacement.. But my husband saw this online another day and decided to order. Almost immediately, when he used it, you can see that he started working.. We left us overnight, and the black is not completely! It is incredible. 1000% deserves (small) investment. Seriously — just buy this. I’m amazing!!” —Nicol Dr.
Get it at $14.99 at the Amazon.