Yes and no. On the one hand: Yes, they are provided in the cleanest possible state on a macroscopic scale and go through several cycles of rinsing in aceton p.A. prior to being shipped out to our customers. On the other hand: No, with the sensitivity  of a surface science technique like LEED or XPS, after our in-house cleaning treatment and transport through ambient, there will always be several monolayers of hydrocarbons and water present on the samples that will prevent the recording of a well-defined LEED pattern or a representative XPS spectrum. Further in-situ preparation will always be required.