Use a cleaner that doesn't have a wax or polish in it.

If you damp mop use a little vinegar with the water.

Water with a little laminate floor cleaner. Film is usually a result of using too much product

No, not at all... There's no residue from ammonia free windex or harsh chemicals. We even tell all our hardwood flooring clients to use it to clean their floors too. But, as with all new things, if you're concerned it may leave your floors slippery (for instance, if you've previously used a different cleaner on them that may cause the slippery effect). just try it out in a test spot, like a corner somewhere and see for yourself. But we've used ammonia free windex on almost every one of our floors without an issue from it, ever.

almost anything needs to be wiped dry after washing to get the best look. I learned that from my cleaning lady.