Damp mops can smell sour and support fine colonies of germs if you don’t watch it. Don’t think that a mop is disinfected even if it was used with disinfectant cleaner. Ideally, you should wash a mop head in the washing machine, with bleach and in a mesh bag, after each use, then hang it to air dry. At least rinse your mop well and make sure it has a chance to dry completely. Never leave it in a bucket of water or crammed in a corner.
Always empty and rinse a bucket when you’re done with it. Buckets are great places for bacteria to breed- some nasty things can lurk in there when you get back if you leave dirty water in them. And even a few inches of water left in a bucket is a drowning danger to toddlers.