Most cars in South East London are left unprotected for far longer than they should be. The damage is gradual — contamination builds, protection fades, interiors wear quietly. So how often does your car actually need a professional detail? The answer depends on how you use it, where you park, and what season it is. We've broken it all down. Daily drivers, families, pet owners, new cars, old cars — and why autumn might be the most important detail of the year.