Actually, almost all commercial hydrogen is made by catalytic steam reforming of methane followed by purification using pressure swing absorption molecular sieves.
Ultra pure hydrogen is prepared by electrolysis.
Hydrogen burns very cleanly with no CO2 emissions , but the manufacturing process to make the hydrogen is CO2 dirty as you make one mole of CO2 per 4 moles of hydrogen, plus a substantial amount of CO2 for the fired heaters for the reforming process. "Clean Fuels" is something of a misnomer when the whole cycle is considered.
Likewise, if the electricity to power your car came from a power plant, it aint clean fuel either.
Solar, wind, tidal and hydroelectric generated power are "clean fuels".
So is nuclear until you consider the fuel processing, fuel rod reprocessing , plutonium burden and contaminated waste generation plus eventual decommissioning.