I have a Hoover Floor Mate. I also have engineered oak hardwood floors. (And a side note: engineered flooring is "real" wood. It's not solid hardwood all the way through, but is composed of layers and the top layer (thickness depends on brand) is real oak with a poly finish and should be treated the same as a solid hardwood floor. As far as Floor Mate, I won't be without it! (Actually, I used the first FM version about 4 years, then a little plastic part broke and water leaked some. So I just replaced it with the purple (500 model, I belive, DH just put it together last night, so I haven't used it yet.) Anyway, I would not recommend using it on hardwood, no matter if it's engineered or solid. It does secrete enough water that it would ruin the floor if it seeped between the seams (and that is inevitable). I do, however, use Floormate religiously on: ceramic, lineoleum and commercial grade laminate. (Our laminate has a rubber backing, since it was installed below grade on top of concrete. It's actually a commercial grade laminate. If I had "residential" laminate, which we are thinking of installing in our kitchen, I would not use the Floor Mate because the underside is not rubber but wood composition and if water seeped between the seams it would ruin the underside of the flooring.) Love my Floor Mate, BTW. The gunky water that is left in the dirty water tank is unreal. I can't go back to a mop and bucket, knowing I'd be spreading that stuff right back onto the floor again. And a double bonus: if you have a bad back, it's a life saver! So I clean my hardwood this way: Vacuum thoroughly to get large particles picked up and to avoid scratching flooring with Swiffer or hardwood mop. When I vacuum, I use a filter queen with a hardwood floor brush attachment (no rotating beater/bristles!). Next I follow up with a Swiffer. (I got Swiffer Max, which is much wider and covers more floor space.) After that I spray Bruce Duraluster cleaner on a hardwood mop and wipe the floors. Love the Bruce cleaner, gets the floors really clean (evidence is on the hardwood mop) and leaves a nice satin sheen (but no residue build-up). Sounds like a lot to do, but it's not really. I can do an entire level of hardwood flooring (3 bedrooms, hall, living room) in under 30 minutes.

You are seeing what we refer to as 'dishout'...and it is a sanding issue. Walnut is very difficult to sand flat. Each of us have a favorite sanding method to get a flat result. I use a machine, similar to a terrazzo grinder, called a Lagler Trio, as the final machine; it never fails in giving an absolute flat result. You will notice dishout and any other sanding anomaly on these dark floors. You will also notice every scratch, dust particle, pet hair and piece of lint.

I read avoiding using steam cleaners on your hardwood floor. It seems using the wood floor steam cleaner machine is not a good idea. Is it correct? I took several hours to clean the hardwood floor by the mop because I am tired and have to take a rest in the middle. I really want to use a cleaner machine instead of mop. Can anyone recommend an efficient and effective hardwood floor cleaner machine?

When it comes to hardwood, trends are something to ignore! Why? Because hardwood is pretty much a lifetime purchase, and unless yours is damaged in some way, you're probably not going to replace it. So, light wood vs. dark wood, wide planks vs. narrow planks -- that stuff's all going to come and go. With that in mind -- as well as the very real concerns about cleaning dark wood -- I'll vote for a nice, neutral midtone every time. Not too much contrast, not too red, and (unless it's a beach house) not too pale. I think this is the wood that's most likely to give you good service and stand the test of time.