Done the same with an AK and SKS, back when they were dirt cheap ($200 for an SKS and a case of almost 1k rounds out teh door at full retail)
However, my rifle is now a FN-FAL. I think it is darn reliable. In fact, do a google for "legend of ol' dirty". FAL that has gone 14k+ rounds with the only cleaning being a trip thru a mud puddle around the 6k round mark.
FALs and AKs make our black rifles seem more like finicky target rifles than instruments of war.
I think ol' dirty had a few drops of oil applied @ some point, if I recall correctly. But yeah, I think my FAL runs smother when it's all caked with carbon. I think it would take a handful of ROCKS in the action to slow it down!
Ice cubes just get smashed.