After I've voided someone a day or two in-game days ago, I try to wifi trade, and they ask me to make sure my void is clean. I'd just like to know how to "clean a void", and/or how many in-game days I should wait to trade after voiding someone?
To be honest I doubt the whole clearing a void thing actually exists
I had streetpassed 2 of my towns with 10 villagers about twice each, then even visited another town with only 9 villagers, but as soon as I turned on my town the next day, there was a plot for the villager I thought I voided :/
I think it's more of a percentage ratio than anything else.
Maybe there's a 50% chance you will or won't get a voided villager
Best thing to do is hope that percentage is in your favor
It may take a day to months. A villager in void goes to its will, pretty much when it feels like it when it finds a free spot to take in any town by wifi or streetpass.
I'm not sure how you could clean the villager out, do you have another game with space or friend who doesn't mind to have that villager if they have space? It's just random pretty much from what I have seen.
On another note, most of the void villagers I have obtained, I have spoken to once or twice in my friends' town. So that like liking increasing the chances. I have never obtained a void villager I have never spoken to.
I am unconvinced that you can ever clear the void. i hear too many stories of how someone got a friends villager who hit the void months ago. Months ago! It seems to be random.