“Brilliant. Had issues with expanding black spot for years. Wish I had spotted this sooner. All black spot gone and the Indian stone flags are as bright as ever been. Have ordered more to do other flagged areas as I am so impressed”
“Second year running that Black spot destroyer has been used on our sandstone flags, and it works very well. Used a watering can to apply it and scrubbed it in on the very black patches. Left it on for 4 hours then jet washed it off. Good result. Will definitely buy again.”
