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In order to achieve a maximum representativeness, the targeted surface is wiped crosswise using a clean laboratory grade tissue soaked with an appropriate solvent of medium polarity. Analytical grade ethanol or isopropanol is suitable for the majority of sampling tasks. The tissue with the sample is then placed into a clean laboratory grade glass container and labelled immediately with an unambiguous sample number. Although ethanol or propanol is suitable in most cases the correct choice of the appropriate solvent has to be adjusted to the sampling task. The solvent has to meet the following requirements:

1 Inert with respect to the wiped surface (You would not want to dissolve the coating of a ship or plane during sampling!)

2 Clean with respect to a minimum of drying residues.

3 Most effective dissolving the targeted substances.