I kind of miss the option:yes I have a garage but it's not heated.
'Cause that would be my answer.
It never gets colder than about 40°F inside during winter, so my detailing stuff is safe.
If the Q would have been : can you work on your car inside your garage, the the Answer would have been a great NO,
My car fits that garage like my hands in a chirurgic glove
Christiaan