How green are the chemicals we put on our bikes to clean, lubricate and repair them? And how much faith should we put in claims of biodegradability and green credentials? Dan Cavallari talks the issues through with Alberto de Gioannini, founder of the Effetto Mariposa brand. His company makes high-quality tools and accessories, and eco-friendly cleaners, sealants and lubricants. Dan looks at the innovative tech behind the products, including the tyre sealant Vegetalex, made from olive waste and described by Alberto as 'like a very bad pesto'.