RELATED: Never Get in the Shower If You Hear This One Thing, CDC Says. According to Terminix, cockroaches can easily crawl through your drain, but there’s a simple action you can take to prevent this from happening. Entomologist Don Miller told Action News Now that covering your drain when you’re not using it can help keep the roaches out. That means you should never leave the drain uncovered after you take a shower. Terminix also notes that cockroaches are mostly nocturnal and will likely come out at night. That’s why it’s especially important to at least cover your drains with a “stopper or screen” before bed to help prevent the roaches from getting in overnight.ae0fcc31ae342fd3a1346ebb1f342fcb RELATED: Never Do This When You Shower in the Morning, Doctors Warn. If you’re concerned about cockroaches making their way through the drain while you’re in the shower, or you don’t want to have to remember to cover it after you’ve rinsed off, you could simply swap out your drain. Do It Yourself suggests purchasing a new shower drain cover that has smaller holes, so that roaches can’t squeeze through. Roaches aren’t relegated to crawling through your shower drain—they can come through any drain opening, including your kitchen sink. The kitchen sink may be especially enticing to cockroaches due to the bits of food often left behind in the pipes. Terminix suggests that you regularly rinse your kitchen pipes and garbage disposals with hot water and a kitchen sink cleaner to rid them of debris and food particles, which can attract these pests. You should also cover this drain at night, or look for one with smaller holes. RELATED: For more useful information delivered straight to your inbox, sign up for our daily newsletter. If you’ve experienced cockroaches coming up through your drain, you can take proactive action against them. Clegg’s Pest Control suggests using a mixture of baking soda and distilled vinegar to combat the critters in your kitchen sink. They advise pouring half a cup of baking soda down your drain, followed by half a cup of distilled white vinegar. After covering the drain for three to five minutes, pour several cups of boiling water down. RELATED: Never Do This When You Shower at Night, Doctors Warn.