I strongly doubt that. First of all, a Glock frame is pretty easy to clean, both in an administrative or field environment. Second of all, when detail-disassembled, Glock components are pretty easy (and large enough for the most part) to permit easy disassembly, cleaning and reassembly. While you can certainly remove the SIG FCU en bloc, I'm a bit unsure if you can adequately clean fine sand, dirt, dust, mud/mud residue, other media contaminants that had worked their way into the innards of the FCU without performing a detailed disassembly.
As Todd Green famously said, a retarded monkey can easily perform a detailed disassembly and reassembly on a Glock. Not so sure if the same applies to the M17/M18, or if you need to be at least at the educated chimpanzee level....
Best, Jon