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A hiss and puff of compressed air shapes the smooth leather, bringing to life an all-American cowboy boot in a factory on China's eastern coast.

"Another factor that comes into play is that we are powering this robot with compressed air," Qing says.

Don’t use a hair dryer or compressed air on your phone.

A professional will inspect your ducts, assess debris levels, access the entire duct system, and use tools like brushes, compressed air and vacuuming to remove accumulated dirt, dust and debris.

As well as avoiding bags of rice, it also advises against drying a wet phone using an "external heat source or compressed air", meaning radiators and hairdryers should be avoided.