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Left them a bit too long unloved with salty gritty dirt on and they have gone surface rusty furry.
Would leaving them in Coke ( or Pepsi) make them shiney again?
Used to work with 2p when I was a little 'un
Try a bit of hard braking, bound to be easier.
You had a rusty 2p?
I would just ride them, let the pads polish them up rather than covering them in sticky stuff.
Maybe fit them and take them out for a ride? Car discs usually develop a bit of surface rust if left for even a day or two, a quick drive has them shiny in no time.
I've just tried muc off's brake cleaner and loads gunk came off. £6 for a big can so might be worth a punt. If the pads need cleaning then try sanding them down a touch?
Might haveba go with Cilit Bang!
Update:
Coke worked well!
find a big hill way more fun
Thank **** you saw sense Pepsi? FFS! 😉