here in greece we seem to deal with the sistuation fine, buttttt
i am genuinely skeptical about the dates of quarantine slackening 27th of april for us.
Yes clean it first with a hose then put distilled water and run it for a 20 minutes let it cool, drain the distilled water,repeat,
after 2-4 times (until you see no more rust) add anti-freeze,bleed sytem and you are done.

5 hours ago, Thefeliciahacker said:

here in greece we seem to deal with the sistuation fine, buttttt
i am genuinely skeptical about the dates of quarantine slackening 27th of april for us.
Yes clean it first with a hose then put distilled water and run it for a 20 minutes let it cool, drain the distilled water,repeat,
after 2-4 times (until you see no more rust) add anti-freeze,bleed sytem and you are done.

I'm very skeptical too, here they want to slowly back to normal from 4 may.....hope everything will go fine even because i had change work the 24 of February so I'm "the newer" .....

Back to the felly , i  have to disassemble the radiator to do the process u said?

Thanks in advance 

No you don't have to, 

You can just unscrew the top radiator hose, remove the thermostat, and flush it with your gardening hose. 

The put everything back in place and drain the system from the lowest point. Fill with distilled water, run, repeat. Then fill with antifreeze.