^I've had that before. There's probably paint or something in there. Wouldn't worry about it.
My bike has succumbed to the British Winter, has anyone tried this shit:

or should I just paint it red? I don't mind a bit of humidity brown cool rust but this is orange shit rain rust and we can't be having that.
I'm guessing it's phosphoric acid based. That stuff has to soak in to work and requires multiple coats. It'd be hard to use on a BMX frame cause it'd just drip off. It says non-drip so it might work, but I have a feeling it still will. If it actually stays on the tube let me know because I'd be interested in picking up some. I used similar stuff on the floor of my car and had to let it soak for hours, wire wheel it, and repeat a couple times.
If you soak it in clean motor oil and let it bake in the sun (or a warm lamp since you're in England) a little it'll turn the rust brown and slow it down. That's what I did to my S&M and I love how it turned out. Or use a brass wire wheel to polish the bare steel, then oil it.
