My wife and I we're surprised and perplexed on how to remove organic stains for a neighbours tree that fell on our backyard patio stones. I hired someone close in the neighbourhood, but they said that I'll have to live with it. I didn't give up and called a few places that didn't give me the answer I needed until I found Seal Tech. Jennifer was awesome on the phone and she said we could remove those stains with some stronger chemicals. The guys arrived, they gave it a first attempt with there normal procedures and it didn't work. They then brought the heavier cleaners and it proved to do the trick. The place did smell for a few hours, but it got the stains out and the sealed it that afternoon. Honestly, They rescued the situation. I look forward to working with Seal tech in the future.