I need to drain water from to baseboard heater i remodeled to bathrm and thats the only thing i have to do (replace the heater)not sure about the way to go about this i know alittle about the boiler two zones,gas
You will probably have to turn off the furnace and open the valve on its boiler to let the water out that way.
You cannot drain just one zone unless it has manually operated shutoff valves on both the outgoing and return pipes as well as a drain valve within the closed off section.
When cleaning anything including baby diapers, it is better to sweep off or scrape off as much solid and semisolid material as you can first. (1) Less cleaning fluid or detergent needs to be used, (2) Less of a mushy mess which in turn means that bleaches or disinfectants will be more effective.