I worked in a chemical plant for years. Our Lab had a catalog that listed all kinds of exotic stuff for tests or experimenting. Lemon Oil, which these products are supposed to obtain, was listed at about 20 bucks an once! So you buy a pint of these furniture polishes how much lemon oil do you think is in them? And this was 30 years ago. As stated above the stuff will not penetrate varnish and similar finish but will clean it. Now what this 'oil' is, is mineral spirits which is actually good for dry wood, if it can penetrate. It may have a minute amount of 'lemon oil' ( no false advertising, you know) and some yellow coloring. Just buy mineral spirts, save money and clean paint brushs with the left over.