Is it against regulations to leave a mop in bleach water over night?

Is it against regulations to leave a mop in bleach water over night?
That would depend who was your superior. Now wouldn't it? It is against common sense for sure. However, how many places actually make common sense into regulation? By leaving a mop in bleach for any extended period of time you are destroying the integrity of the fabric that the mop is made out of. Bleach is a very powerful base that eats/corrodes fabric and other natural materials. It may not be a rule or regulation but it would be wise to take the mop out and rinse it when finished, then stand it on end or hang it to allow the mop to dry so that the fabric does not mildew. Mildew also decomposes the mop fabric and creates an allergic mess for those that can't be around mold or mildew. So, to make a long answer short... Rinse and dry out your mop so that it lasts longer.