It’s safe on all surfaces, and it’s even disc brake rotor and pad friendly.
Says Mr Muc Off
Aren't the proprietary disc brake cleaners just isopropyl alcohol (IPA) which can be brought much cheaper than the proprietary stuff. It's what I use to clean my pads (disc and rim brake) along with rotors and rims if they're really grotty.
Probably, but the only place I could get that from on the way home was Maplin, where a 400ml can was £9.99 vs £4.99 for 250ml Evans brake cleaner.
Seems to have done the job anyway.
@Cranky started
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Says Mr Muc Off