The history of mouth rinsing goes back to BC. Its mention has been found in the Ayurveda and Chinese medicine where it has been recommended for the treatment of gingivitis. There are so many examples out there that show that mouth rinsing has.
Bay leaves are the most efficient and natural cockroaches repellent. Both, dry or fresh bay leaves can be used as cockroach repellent, but still crushed dry leaves in a powder form are most efficient as they release much stronger smell.