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I use Fresh Cab inside the cabin, frunk, and engine compartment, & one on the ground front & back. Never had a problem since. I get them from the local farm store, but I think Lowe's & Walmart has it. The winter I didn't use it those critters made a home in my vette that was a hell of a mess to clean out. Cheap insurance.
If they are a problem for your car, they are a problem for other things as well. That's all I'm saying.
Not necessarily. I've had them get in multiple cars and haven't had them in the house per say (in the garage in the car only). My Chevy volt was particularly amusing as they nested on top of the engine and I'm sure I was driving them around for a few weeks while under battery power. They also made it in my 1966 Corvette and my 1998 corvette. Luckily, no damage so far as I guess I drive them just enough to get them from eating wires.
Cars that don't get driven often are targets for some reason... and your area/landscape is another. I happen to back up to green space (woods) and we are likely more impacted than if we lived in suburban hell where there is no green space.
The thermal mass of an engine is an attraction for critters. The 500 (SB) to 650 (iron BB) pound engine will warm during the day and at night, when temperatures can plummet, the engine stays relatively warmer. A pronounced effect for cars outside under a car cover. Even in a garage, in areas were daytime temperatures are elevated in daytime relative to nighttime temps, the engine can be a refuge. Particularly if the critter makes a bed out of straw, leaves, stray pieces of cloth.
For a while I had a bare block with heads, valve covers, sitting on a frame. No intake manifold. From the gallery area, between the V banks and above the cam shaft "roof," a mouse was able to enter the underneath of the valve cover and make a nest in the head among the valve spring towers. A disgusting mess of poop, straw, pee staines. Before you ask, it was a Chevy rat motor, not the mouse motor.
I too use Fresh Cab, can find it at Tractor Supply.
I also found the dollar store version of Pine Sol sprayed around my garage helps too, no problems with 2 years usage.
I bought a Mouse Blocker. It took about 4 weeks during last winter before it started working. Mice find a way into the garage to escape the cold. Best place to put the MB is on the floor up against the wall. Try not to block the light beam (that you can't see) to the opposite side garage wall. Other than lights blinking on the MB the devise is silent. My mouse built a nest on top of the C7s cabin filter. So now I have peace of mine. I stopped pulling out the cabin filter just to check.
I snowbird to Florida in the winter and have taken my C8 with me. My condo is on a peninsula with the ocean on one side and the mangroves and intercoastal water on the other side. The ground level of my Condo is a parking garage with 33 spots for owners and guests to park a vehicle.
River rats are a big issue on the peninsula. Last year the little bastards got under the hood of the frunk and nibbled on the piece of trim that diverts water off the windshield. This year they nibbled enough of it to the tune of $500 worth of damage. I used peppermint repellant to spray around the entire car every night plus I rolled up a hand towel soaked in peppermint repellant and stuffed it on the driver's side where the frunk meets the windshield.
Until I can come up with a better solution to deal with the rats, my C8 will probably remain in Ohio from here on out.
This is the best thing I have found for mice in a long term (months) storage situation. I use this for boats cars etc in my pole barn. I jack the car or trailer up and put it on jack stands and have the jack stand IN the bucket. The mice cant really climb up the bucket and problem solved. In the past I've had damage from mice on both my C6 and boats but since using the bucket trick, no damage or evidence of mice in the cars or boats for several years. This is a yearly process for winter. During the summer the (now c8) is in a garage that is mice free