If the care instructions on a garment explicitly state "no iron" or "no tumble dry," it typically indicates that the fabric or garment is not suitable for direct heat or high temperatures. It's important to follow these instructions to avoid damaging the clothing. However, it does not necessarily mean that the garment will be ruined if it encounters occasional heat, such as getting in and out of a hot car or retrieving food from the oven.
The "no iron" instruction generally means that the fabric cannot withstand the direct heat of an iron. Ironing can cause damage, such as scorch marks or melting, to fabrics that are not designed for heat exposure. Therefore, it is best to avoid ironing such garments altogether.
The "no tumble dry" instruction suggests that the fabric or garment may not be suitable for the high heat and agitation of a tumble dryer. Tumble drying can cause shrinkage, distortion, or other damage to certain fabrics. It is advisable to air dry or follow alternative drying methods recommended for those garments, such as laying them flat to dry.
In the situations you mentioned, like getting in and out of a hot car or briefly handling hot objects like food from the oven, it is unlikely to cause immediate or significant damage to the clothing. These actions generally involve brief exposure to heat and are not equivalent to the prolonged or direct heat of an iron or tumble dryer.
However, it's always important to exercise caution and use common sense. If a garment has specific care instructions, it's best to follow them to minimize the risk of damage. If you frequently encounter situations that involve high heat or you're unsure about a particular garment's tolerance to heat, it's advisable to choose clothing made from heat-resistant or heat-tolerant fabrics to ensure their longevity and avoid any potential issues.