I used vinegar to clean rust out of a CL100 tank. That worked like a charm. Got every bit of rust out after a few days of sitting....
2012 KTM 250XC-W "Ginger"
..I am a Patriot. I protest speed limits by Exceeding them... - Christopher Titus
"40 mph get offs hurt. Momentum is your friend until itís not." - Ladybug