I was able to get about 90% of it with Simple Green. It and Babes were about the same. Since I had more Simple Green I used that. I had a brush that I used on some of it (the harder spots). They lightened up, but are not completely gone yet. I will try something a little stronger once I can get the boat out, opened up, and let it air out for a day. Right now it is still raining on and off and crappy out. Mike suggested some Peroxide. I tried, but did not get any different results than what I did with the Babes or Simple Green.