Sorry I only suggested the car stuff, as it came up on a thread off here, and is cheap and easily available. Though have a m8’s who have used it without issue – I just use electrical contact cleaner (Isopropyl).
As for muc off, no idea what you doing there, I’ve used it for years without any issue, never worried about over spraying the brakes.
another question, when i do get round to upgrading the brakes and the likes, will anything be possible or will i be limited to what will fit? like, would it be hard to fit hydraulic brakes to the bike? are there any other parts that i should look into upgrading eventually?
It’s not hard, just a matter of confirming what type of mounts your frame/fork have and getting those type mount brake calipres or including an adapter to enable it to fit, when you buy. You’ll probably need to shorten the hydraulic line (come quite long, to ensure they will fit any bike), which be a little worrying as a newbie mechanic.
Bars are pretty easily replaced, though off-hand I’d check out the 2nd hand market, as the ones fitted are probably the traditional 25.4mm (one inch) rather than the now more prevalent oversize 31.8mm (measure it where it fits the stem, though visusally, if its oversized it obviously get bigger towards the middle). So lots of ‘older’ bar are sold off cheap, and should be easily avaiable up to 700mm wide.