I am going to start using the bicarb/vinegar in my machine. I just have a few questions first. I have a LG front loader.

You ladies have said to put the bicarb in the barrel....do you put that in before or after you put the clothes in? Why do you put it into the barrel instead of the washing powder dispenser?
Is bicarb safe for use on MCN?

I use powder at the moment...is it better for the machine to use liquid?

ETA: Also, is it ok to just use the cheap "no brand" vinegar and bicarb?

TIA