Is this the same slimy, green gunk sold in the UK under the
brand name Swarfega?
As a Brit now living in the States, I can confirm that these are
entirely different substances. I’m not aware of anything similar to
simple green in the UK, but I’ve never looked for it there. There is
something similar to Swarfega in the US though, car mechanics use
it- I forget what it’s called though.
Simple Green is a liguid, Swarfega a gel (at least I think that is
what it would classify as).