While it is nearly impossible to keep every single bug out, the most effective strategy in 2026 involves creating a multi-layered barrier. First, you must seal entry points: use caulk to fill cracks around windows and doors, and install door sweeps and fine-mesh screens. Second, eliminate attractants by keeping the kitchen crumb-free, storing food in airtight containers, and fixing any leaky pipes that provide water for pests like silverfish. Third, use a residual insecticide barrier, such as Ortho Home Defense, applied around the perimeter of the house and along baseboards. Additionally, keeping the outside of the house free of debris (like firewood stacks or standing water) removes breeding grounds. For a "natural" deterrent, many homeowners use peppermint oil or cedar blocks, though these are generally less effective than professional-grade chemical barriers and physical sealing.