I love preen. It has saved me so much work.
I also bought one of these on Amazon and I really like it, you do have to be on your knees somewhat to use it, but I am there a lot anyway. Found that it is easier to just get all the way down than to try to bend and reach things I really can't. This little tool will take downright abuse, but it does an amazing job for it's purpose. I have used it alot. Even my kids like using it, I had to order one for my mother.
https://www.amazon.com/dp/B003BK2IMO/
