Toroflux are made of 100% stainless steel, and rust should not be a problem. If it gets wet, you may let it air dry, or use a towel. A soft cloth and some soapy water should be enough to clean it. 

Do be careful when handling, as the toroflux is made of a single strand of thin metal. If it's bent or if one or more of the coils is pulled hard or roughly, it can deform and will not handle as designed. Please note that we cannot replace torofluxes that have been misused or deformed for free, however our warranty applies and you can send back a kinked toroflux for a half-price replacement.

Hope this helps and please feel free to contact us if you have questions!