Hello all and thanks in advance for any suggestions. I built an Ipe deck (2200 sq ft) a couple years ago. I didnt do anything to the deck and let it fade to silver. I decided to clean it and stain it this week (or so). I am using the RAD system and still cleaning using Part 1. My issue right now is that in certain areas where I either had a mat for my grill or ceramic planters have a black outline. I used RAD part 1 several times over these areas and still the outline stain does not go away. Before I go to Step 2 (Brightener), I wanted to know what I should do to remove these stains or will the brightener remove them?

The area does have trees and bushes around the area. Should I just use diluted bleach?

Thanks, Jim (Maryland)