looking for advice, which I am then going to test, document and report back on here which was most effective to remove bird poop from my TS.
So I left my TS in the water for 2 months while I fixed the trailer. To come back and find it had become the new Shag Island. I collected that much guano I am pretty sure it is worth more to a farmer than a sailor, the entire bot was about 1-2inches thick, and in some spots deeper.
I decided to take it home and high pressure water clean it on the grass to fertilise my lawn at the same time, and thoroughly upset all neighbours down wind of me.

This took off the chunks burs it did little to remove the residue and my yacht looks likes a bowl of melted Napoleon icecream.
Whats everyone's recommendations for what works best to remove these beastly stains? Im willing to use my boat as the tester, scientifically trial different chemicals in different spots, test how easy it is use, effectiveness and if it causes any other discolouration. Then report back to everyone which trick worked best.

Im going to start with some truck wash, some white vinegar, some common enviro friendly floor cleaner and whatever boat wash I can find at super cheap. Any other ideas?

Pictures after high pressure water cleaning 3x times