Quick one!
Just wanted to know, I drained my CH system but only realised now after filling it that one of the rads upstairs i didn't open the weathershield valve (thermostat adjustment on the rad), is it likely that the radiator upstairs would have emptied itself via the otherside so the lockshield valve route when i drained downstairs - my reason for asking is i want to make sure no CH cleaner is in the rad, and my thought is it wouldn't as it would flow out the other side (lockshield valve pipe?, as well as any remaining fluid from the weathershield pipe flowing down)
Both pipes obviously flow up into the rad.
