I dispute with my friends

Having mixed success with Chinese household appliances. Was privileged to some inside information suggesting program B on the washing machine, clothes seem to have turned out ok. The extractor fan in the bathroom is controlled from a bewildering panel of five switches . Have managed to figure out on/off and blow/suck, but have no idea as to the function of the other three. Kitchen also contains a device that I think was described as a ‘steriliser’. Sits above the sink looking a bit like a microwave. Two buttons on the front panel activate some sort of ultra-violet zapper (not quite sure about the technology behind this, would need small pet to verify) and a hot air dryer. I rinsed a plate, glass, knife and fork and zapped then dried them using this machine. Think I'll just use it as a drier in future.