Cleaning a valuable coin can reduce the value as much as 90%. Removing original surfaces and turning a coin pink, pretty much reduces the coin into the circulation face value amount. Most had core collectors look for the best examples. Anything less, they pass on. Why? Why deal with a problem coin. when buying, keep in mind that someday you may want to sell that coin. So why lower the value by altering reducing the value. The original surfaces go away when they are attempted to be altered. Why ruin a coins collectable life?