I removed and washed the canvases once this Leclerc Nilart 12 harness loom made it home with me. Canvases were attached with staples. A stout, dull letter opener was able to be inserted between the staples and the cloth without cutting the later. Canvases should be attached with carpentry tacks. Carpentry tacks may have come with the original unit, as there was a pack of them included in the items that I brought home with the loom. Washing made the canvases much cleaner. I washed them in hot water; I did not put them through the drier. The pockets that hold the warping bars frayed. Today I trimmed these pockets, a necessity as these threads can get in the way and hinder attachment of the warp.