I always used the small eye icon on the layer panel to hide selected layer. But now I found one clever keyboard short cut, which will do the same job: CTRL+3. Another useful short cut is for displaying all (hidden) objects on the canvas – you can do this via menu item Object/Show All or via short cut CTRL+ALT+3.
You should use this short cut or command and delete all unwanted objects before you save your artwork for uploading on some stock site (otherwise they will return it back to you). On the illustration for stock site shouldn’t be any hidden layer (especially when it is some working object or graphic you used as a draft).
P.S. This is my first (and quite simple) article with tips and tricks for Adobe Illustration, there will be more tips in the future.