Thanks for the suggestions. It sounds like removal of the flame bars
followed by a good soaking and pressure wash is the way to go. As to
reaming out the holes or wire brushing them, the holes in the Weber
Silver flame pipes are very small slits. As I said, I can get my small
pocketknife blade in them a bit, but not much. Brushing them will
likely clog them more with metal flakes, and reaming them out is
simply not possible. I could stick my tiny blade in each one a bit,
but that would take a long time to do them all, and may just
temporarily push the clog aside, instead of really removing it.