Chomp is great! It removed the heavy black streaks on my painted aluminum gutters - as advertised. Reminder - follow the instructions and test the product first. It can remove paint on old aluminum gutters so pay attention. It's refreshing to purchase a product that might be a little too strong versus too weak and ineffective. I also bought the gallon refill in addition to the 32 oz spray. To my surprise, the 32 oz sprayer lasted a lot longer than anticipated, so I have plenty of product left over for future use. Also, the delivery was lightning quick - I was fortunate to receive it overnight and it was free shipping! I will definitely recommend this to my friends and also let them use some of my leftover product so they can see the results for themselves.