What is the cheapest way to restore your hardwood floors to a shine if they become dull
We used a company called Mr. Sandless. https://www.mrsandless.com. They had a machine that gave the floors a really deep clean. Mr. Sandless does not refinish the floors...just a DEEP clean and buff. I can't remember if they also put a poly sheen on it afterwards or not but the floors did come out really nice. I now clean with Bona for hardwood and then buff. It was so much cheaper than refinishing. Good luck!
There are products out there to restore the shine. https://www.hometalk.com/4975587/what-i-use-to-shine-my-hardwood-floors
I use Bona for Hardwood floors.
Here are some videos to give you some very good tips.
Bona for cleaning and shining. For a bit of restoration, I use Rejuvenate.
I use Quick Shine and am happy with the results.