Don't put a car cover on a dirty car, it can scratch it.

Car covers can be overrated, like car alarms and car "bras" Sometimes the negatives outweigh the positives.

I can't really say; to me all of them are a nuisance and sometimes do more harm than good. It just depends on the location and circumstances.

Some neighborhoods I saw in Lima (Peru) had homes that seemed to have as their prime consideration, the protection of the owners' cars.

Very high brick or concrete walls topped with barbed wire and shattered glass, with the cars parked on the other side.

It looked like the cars were in prison. The house residents, too.....

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1991 560 SEC AMG, 199k <---- 300 hp 10:1 ECE euro HV ...

1995 E 420, 170k "The Red Plum" (sold)

2015 BMW 535i xdrive awd Stage 1 DINAN, 6k, <----364 hp

1967 Mercury Cougar, 49k

2013 Jaguar XF, 20k <----340 hp Supercharged, All Wheel Drive (sold)