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If your deck is stained so badly that the use of oxalic is necessary use caution. The oxalic acid should be diluted with fresh water. Rinsing immediately following scrubbing as you work is necessary. Rinse very thoroughly after every small area is scrubbed. Also rinse the hull carefully where the water exits at the scuppers. Plastic scuppers can be damaged by okalic acid if not rinsed frequently during cleaning. Anything beneath the boat will be damaged by the acid if not quickly rinsed. Think of your trailer and any lawn or asphalt parking area.

I've used the acid in the past to cleans stubborn stains in my boats teak trim. My recommendation to use caution is based on my experience.

CaptCol's cautions are not over stated.