A few years ago I had just the cupboard door facings replaced by SEARS, (using the original shelving that was initially installed when the house was built.)I am wondering how to clean this finish. Now after almost 8-10 years it is looking a little grimey but I don't want to destroy the oak wood finish on it. Any suggestions what is safe to use on this type of cupboard door?? Someone recommended I use steel wool but wouldn't that scratch the wood?