My story about oxalic acid; apologies to those who've seen this before but I think worth repeating.
I was degreasing my boat's topsides prior to painting, so used an off-the shelf oxalic acid cleaner from a chandlery.
As the instructions said ' to deactivate, add water ' I foolishly thought it must be feeble stuff; I let the residue run down my bare arms.
Within minutes I knew I was in trouble, so ran to the loos and put my arms under running water.
This did not work, by now the burning was so intense I thought it might go down to the bone !
Luckily Pat, an ex hospital Matron knew what to do; I had to fill a basin with cold water and keep my arms submerged for a good 40 minutes.
Pat remarked afterwards that the burns were quite shocking even to her, a minute or two more and it would have been an ambulance job.
I wasn't even using eye protection, I'm sure if it had got into my eyes I'd be blind now.
This was about 1990 and I'm assured by people who should know that this must have been an unusually strong oxalic acid solution compared to todays' stuff; however, don't chance being a chump like me, it wasn't much fun !
Wear protective clothing especially eye goggles, and bear in mind neighbouring boats and passing people.