I use the Park chain cleaning tool with Park citrus cleaner, blast it off with garden hose using a small orifice spray nozzle, blast the water out with compressed air from my Craftsman compressor (at 40 psig or above), then re-lube with whatever (currently DuMonde light or regular). The magnet in the chain cleaning tool picks up metal and a lot of grit gets removed in this process. My chain consumption has fallen off markedly since starting this. I do this when the chain starts to make some noise, per the DuMonde recommendations. This summer that amounts to every couple of months or less