Yes it sure is a dirty job, and the smell gagged the shop, in my case. I put a tray by the pump inlet to catch the last bits washed out, then paper rags the rest. Kero or Jet A far to flammable IMHO. Your looking for trouble there. How many times have you had sparks come off dull tools, or an extra heavy cut with red streamers. No way.
Long time ago a teacher demonstrated how Flour burns, put a propane torch to a handful of Flour, turns black smells like bread, stuffed some or it into a straw, and blew it at the torch, nice 2' fireball. That how that Sugar plant blew up last week.
Kero vaporizing off hot metal, and then a spark. Toast.