Hadn't seen any videos of people doing this strategy so thought I'd record my attempt, Basically just put Red Candle fires all over the spawns to hopefully insta-kill everything
I took Butter Bean incase I fucked up because I thought it miiight let me restart by touching it again if I exit the game? Wasn't sure but thought it was worth a shot.
I didn't realize the Larry Jr. and Hollow would spawn at the bottom so that was pretty scary lol, Peep's Eyes and the Mask destroying a lot of the fires really scared me aswell but I had put down way too many fires anyway so it turned out ok.
Screenshots of the fires before and after: http://imgur.com/a/Hcyol