Not everything turned out perfect. There where a few remaining stains that went deep. The only sure way of fixing these is to replace the boards. Sanding more may only have created a serious dip in the floor and if failed to remove the stain then the whole overly sanded area would have had to be replaced. We told him in the beginning we didn't expect miracles with this incredibly abused floor and so we ended up with a few "beauty marks" as my wife calls them.
"We must reject the idea that every time a law's broken, society is guilty rather than the lawbreaker. It is time to restore the American precept that each individual is accountable for his actions." -Reagan
The problem with socialism is that you eventually run out of other peoples' money.