If the top adhesive mat is soiled, you can simply remove this layer and work directly on the next one of the stack. The number of remaining mats on the stack is indicated by the number in the corner.

Mats for cleanroom
Mats adhesive, for fine dust
Cleanroom fine dust mats
Cleanroom sticky mats
Mats for cleanroom
Mats adhesive, for fine dust
Cleanroom fine dust mats
Cleanroom sticky mats
Mats for cleanroom
Mats adhesive, for fine dust
Cleanroom fine dust mats
Cleanroom sticky mats