Cleaning your rain boots will guarantee their longevity. But different manufacturers use different materials for the construction of these boots and for this reason the cleaning methods and techniques will be different. Leather is most difficult to clean because dirt can easily scuff them. For these shoes, you will need a leather-cleaner as well as a conditioner and contact the manufacturer for these products.
For cleaning nylon boots you need to use cold water and hand wash them. You can also use a mild detergent, rinse them and allow them to dry naturally, without any heat. For the rubber shoes, you will need warm water and wipe them off. Allow them to dry by leaving them out in the open air.