Convertibles with a fabric roof: Fabric roofs are more delicate than hardtops and can be damaged by the brushes in a car wash. If your convertible has a fabric roof, it's best to hand-wash it.
Convertibles with a removable hardtop: Removable hardtops can be heavy and difficult to remove. If you have a convertible with a removable hardtop, it's best to take it off before going through a car wash.
Convertibles with a sunroof: Sunroofs can be damaged by the water and soap in a car wash. If your convertible has a sunroof, it's best to close it before going through a car wash.
Convertibles with aftermarket modifications: Aftermarket modifications, such as spoilers, can be damaged by the brushes in a car wash. If your convertible has aftermarket modifications, it's best to hand-wash it.
If you're not sure whether your convertible can go through a car wash, it's best to consult your owner's manual.