I don't usually write reviews but this product exceeded all expectations that I cannot resist sharing my experience. We pressure washed our home with the bleach solution and it worked great on the vinyl siding but not on the black streaked gutters so I bought CHOMP to try. The house is a ranch so I actually used a step ladder, sprayed on the cleaner and wiped it off with a terry clothe immediately using very little elbow grease. The gutters sparkle and look like new again. It also worked on the vinyl siding where the pressure washing didn't completely do the job. Thank you CHOMP!