coolant flush question

[diego04]

So my radiator cracked on me,so I ordered a new one tovswap it out, I took out the oem(obviously coolant drained) but there is still a little bit in the filler by the top mount,how do I get it out because I'm mixing my own formula 50/50 ,but I used to use the premix so that's What is remaining,.is there a way to flush that out or can I Just fill up with no harm done,

Thanks in advance

[oguitar]

Just fill it up and burp it a lot. Also make sure to use Subaru coolant and conditioner.

[rage-wrx]

^^^burp the system & use Subaru Coolant & Coolant Conditioner & Subaru Long Life Coolant (it comes pre mixed)