when i clean rotors, i wash them and scrub them in my parts cleaner, then rinse in water, leave to dry or dry with paper towel, then spray on disc brake cleaner, i usually use Fenwicks but to be fair the muc-off one i think is good, i started using that because i had a workshop size bottle that came with a workshop pack and frankly i think it's very good, after that has dried off if i am worried i sand the rotors.
to bed in the pads, wet the pads under a tap, rub pad surfaces together until they start biting on each other, dry pads with paper towel, fit to calipers, set up brake, take outside and ride around in circles with the brakes on a bit to bed them in.
i find this procedure works.