1) For the Aluminium and Maplewood frames, the warranty is for 10 years. This does not include mechanical/replacement parts such as springs or wheels since they wear out from use and will need to be replaced in the future. 
2) The warranty does not include causing damage by usage such as scratches, tears, or using the wrong cleaning liquid for the upholstery. 
3) You can only use non-chemical and non-alcohol based cleaners for the best and long-lasting results such as liquid soft soap cleaners or organic surface cleaners.