Soapy water - didn't even touch it
Meths - nadda
White Spirit - removed a few balls of loose gunk, but barely touched it.
Petrol (well, 100:1 2t mix as it's all I had) - worked, but still too 15 minutes to clean a seatstay with a microfibre cloth.
a) WTF is this stuff that peels off when you don't want it to, but is as sticky as a wrapperless week old boiled sweet left in the car.
b) What gets rid of it? Would a green scouring pad mark the paint if used in conjunction with petrol?