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You could check out WeMoto they do some good alternative disks (and pads) which ARE cheaper than Honda. I replaced both front and rear discs at around 120K miles with HONDA replacements. I prefer to use Honda brake pads - front tend to last ~25K and rear a bit more

If pistons won't go in easily I would pump em right out and fit new seals (once the groves have been cleaned out ) and probably stainless pistons -you are bleeding the system anyway !

As slowboy says, not petrol. If you really need to use any liquid then paraffin or even white spirit will do, it'll mix with engine oil with no issues and won't attack any rubbers etc. I wouldn't worry too much about small residual amounts, it won't do any harm. I'd try to simply wipe with heavy duty paper wipes or clean cloth/rag where possible, chances are there isn't really any dirt etc in there that require any sort of cleaning as such, just wipe, check there are no obvious bits and pieces, and you should be fine. Have a good look round with a decent torch/light, you should spo

To be fair, that disc's probably only got a couple of thousand miles left in before it needs replacing

They are taking it to a level that's stupid. The old disc had grooves in it like record (that's a vinyl to the kiddies). The new pads will have started to get matching grooves. Put a mismatched pair together and instead of fitting and making the contact area bigger they meet point to point and gap to gap. They wear like **gg**y and brake like a greased shopping trolly. Eventually they either wear out of wear to match. If one is past its best it'll wear out. Your pads have started bedding in with the wrong disc and it will cost you a few miles. It'll sort itself out. A

I definitely Would not use petrol, modern fuels are nasty stuff and the vapour is very volatile, unless you like the significant risk of going up in a ball of flame 🔥 Even outside....... Any decent proprietary de-greaser will be fine, but may not be necessary. Wipe the sump out with a cloth and if there's nothing there it should be ok. As Embee said, get the old clutch cover off before you replace the sump plate and chase/flush anything through if necessary.