I don't shower with it (ref. the L4 thread /ubbthreads/images/graemlins/grin.gif), but mine (oops) just went through the washing machine in a pants pocket, and emerged working fine. Nice and clean, too.
From what I've read here, you aint the first /ubbthreads/images/graemlins/grin.gif . They've been washed, dried, microwaved, and run-over by whatever. I've toyed with the idea of firing one of mine straight-up outta my .50-70 with a blank on a moonless night out in the desert. /ubbthreads/images/graemlins/grin.gif
(California-legal tracer?)
When I saw the thread's title, I thought it was something about AAA cells, not a flashlight that got run through the wash. /ubbthreads/images/graemlins/blush.gif
I'm glad your SureFire L4 (KL4) came out OK. Clean, but OK. /ubbthreads/images/graemlins/grin.gif