Which is the best method of removing particulate from an A/C system after a mechanical failure?

A/C flush solvent, can remove debris from lines and hose assemblies that do not have mufflers in them. If the line or hose assembly has a muffler, then it cannot be flushed and must be replaced.

Parallel flow condensers.

Condensers that are used on R-134a systems have very small passages. In the event of a mechanical failure, the passages of the condenser get clogged and cannot be effectively flushed out. The condenser needs to be replaced.