A knife block can foster mold and bacteria, particularly down in the knife slots. Start by removing any crumbs and debris from inside the block. Next, you'll want to thoroughly clean the block inside and out with soap and water. Finish up by sanitizing the block with a mild bleach solution.
Turn it over. A simple method is to start removing some debris or debris that may have accumulated in the block, and then simply transfer the entire process. Spend a minute or two shaking on the rubbish to help remove bread crumbs.
To help this process, try using a hair dryer to remove bread crumbs.
Try vacuum. Connect the crevice tool to the hose and place the knife block as far as possible. This should suck out most of the trash
Use a pipe cleaner to enter the slot. Stick it there and use it to get away from the corner. You may need to twist or rotate it to catch dirt. Clean up your tools from time to time, so you are still removing dirt instead of adding it.