In that case, I would recommend using your time machine to go back in time and buying something to protect the floor from the sofa.
Short of sanding the floor down, there’s really not a lot that you can do. The dents and dings aren’t going to pop back out; it’s not like auto repair where you can use a suction cup to pup them back up. Sanding the floor down is expensive; you’re looking at thousands of dollars to have it done by a professional that will do it correctly. Doing it yourself is… not a great idea, unless you are a perfectionist and have a pretty good idea of what you’re doing. Even then, renting the machines–or buying!–and buying the needed sandpaper, CA glue, and poly finish (assuming you want to use poly; I have other finishes that I prefer, but poly is fast and usually non-toxic) may well be more than your deposit.
The argument that you’re going to want to make is that this is expected wear and tear; that might fly with your landlord, it might not. You could make a small-claims case out of it, and you might be able to win that. Or you might not, and then you’d be out your deposit, plus the cost of filing a small-claims case.
In that case, I would recommend using your time machine to go back in time and buying something to protect the floor from the sofa.
Short of sanding the floor down, there’s really not a lot that you can do. The dents and dings aren’t going to pop back out; it’s not like auto repair where you can use a suction cup to pup them back up. Sanding the floor down is expensive; you’re looking at thousands of dollars to have it done by a professional that will do it correctly. Doing it yourself is… not a great idea, unless you are a perfectionist and have a pretty good idea of what you’re doing. Even then, renting the machines–or buying!–and buying the needed sandpaper, CA glue, and poly finish (assuming you want to use poly; I have other finishes that I prefer, but poly is fast and usually non-toxic) may well be more than your deposit.
The argument that you’re going to want to make is that this is expected wear and tear; that might fly with your landlord, it might not. You could make a small-claims case out of it, and you might be able to win that. Or you might not, and then you’d be out your deposit, plus the cost of filing a small-claims case.