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The boat is a bilge keel 8 metre yacht that's been craned out of the water. I'ts been high-pressure/temperature steam/water jet-washed. I'm in the Thames estuary which is notorious for its sticky...

Is it safe to mix hydrochloric acid (36%), phosphoric acid (45%) and oxalic acid (5%) in a water solution?
The mixture will be used to remove hard clay deposits from the hull of a boat. Can you...