Secure Your Garbage:

• You put the trash in the garage, so you don’t have to worry about it. But if you have bugs or pests going after it, you should worry.
• So store your garbage outside, whenever it’s possible.
• If you absolutely must keep trash in the garage. Clean out the can with bleach or another cleaning liquid on a monthly basis. Rinse well, and also be sure that all garbage bags are tightly tied before they go into the can.

Find the Entry Point:

• You need to see where they are coming in. There may be no visible holes, so you need to take a flashlight to all nooks and crannies.
• Remove all items from the garage, sweep the floors and use a portable fan to dry any areas with visible moisture. Moisture can attract certain insect species, and wood, pipes, furniture, clothing, boxes and other objects can offer shelter for small animals and insects.

Seal any Cracks:

• Inspect weather stripping on the top, bottom and sides of the garage door, windows and entrance doors. If any door or window appears damaged or you can see daylight when closed, replace the weather stripping.
• Go around the interior and exterior of your garage and look for any little holes or cracks that unwanted intruders may be using.
• Regardless of their size, cracks in garage floors can invite pests and vermin into your home. Though repairing concrete can seem like a daunting task, it can be relatively easy to do yourself, given the proper tools. You can also add a new coat of paint, which can add an extra layer of protection if it repels stains, water or bugs.

Declutter:

• Clutter and also dust make pests feel right at home. Spiders, snakes, and other creepy-crawlies tend to want to hide in tiny little nooks and crannies. The typical garage offers many such spaces! Cleaned your garage and get everything organized. You might consider keeping a can of insect spray nearby in case you find a happy family of six- or eight-legged critters.
• If you have reason to believe that you might find a snake, wear boots and gloves. If you find rodent droppings, clean them up with care, as they could harbor illness.

Call in the professionals if necessary:

If you have tried all of the above suggestions and are still having a problem, calling a professional exterminator service might be your best bet

For best results, you may need to have them come back every three to six months to keep the situation under control.