I feel a bit dense given how simple many here seemed to find this one! I have at this point all but a handful of clues solved, with a generous handful of clashes in the grid. I believe I’ve found three examples of one treatment and potentially one example of the other, which I don’t actually understand. What’s most confusing to me is that, with the number of clues remaining to be solved, it doesn’t feel like there are even enough answers left to which treatments must be applied in order to reach 12—which simply means I’m still missing something important!