I have just been given a Singer 1917 127K which belonged to my husbands' grandmother. My query here is how I clean...only clean the veneer on the cabinet. I don't want to strip it and re-finish it as it is in good condition and I want to keep it looking "its' life". The veneer isn't cracking or peeling, just seems to have a lot of darkened grain. My question is...could this be how it always looked or is it grime? How do I clean it without stripping? Can I just use detergent and a soft brush...will this damage the veneer or its' finish? Thanking all in anticipation....