Your attempts to rid yourself of them will likely result in more of something else. If you know there are certain areas where snakes congregate around your home you can also soak a piece of cloth cotton ball or cotton tipped swab with the solution and place it in the area.
Check back in the garage after an hour to see if the snake has left.
How to get rid of garter snakes in my garage. If you want them to leave willingly get a cat for the garage. How to get rid of snakes in your garage or shed contacting professional wildlife control at the first sign of activity helps house residents avoid being bitten by a snake in the garage or shed. This will concentrate the smell and make it even worse for the snakes.
Or you can try to find it yourself and remove it. You need to eliminate all piles of brush old wood junk and tall grass around your property. Placement mothballs mothballs can repel the snakes attack and you should place them around the parameter of your garage.
You need to go around the outside of. Open a door on the garage and leave the area which will give the snake time to leave on its own accord and most will. You can build snake traps yourself or buy them but with a simple funnel trap or minnow trap you can collect your unwanted neighbors and relocate them.
You can call a snake removal service and ask that they come search for the snake. You could set a snake trap.