A cleaner for cleaning a surface comprises a floor-engaging portion for moving along the surface. Irradiated polymers and fabricated articles, such as medical prosteses, comprising irradiated polymers also are provided. Methods of forming microparticles containing one or more cells encapsulated by a substrate are also provided, as are methods of forming an array of said microparticles. An end of a conduit is positioned in the space and compresses the insert when the compressive load on the prop exceeds the compressive load capacity of the insert. Optionally the length of the sub-gate is about double the length of the remaining portion of the gate. The user depresses the deactivation button to deactivate the LED.