I haven't seen it, though I'm, skeptical:
"Compared to a recent Cobain documentary that played on HBO and in theaters, the new movie seems to lack the involvement of anyone intimately close to the musician. While “Montage of Heck” had the endorsement of Cobain’s friends and family, including his parents, Love and daughter Frances Bean Cobain, “Soaked in Bleach” centers on testimony from outsiders hypothesizing about the case."