>>5697866>>5697159Is the arm joint from the MG Infinite Justice, tree J.
It's ABS. PS and ABS are chemically different, they may react to the same solvents but the magnitude of their reaction is vastly different. A fast evaporating solvent like white spirits won't damage anything except compromised or weak (very small, thin, etc) PS parts because it's gone up in the air before it's had a chance to do serious harm.