Knives, Grape products, Kailim, Baked goods

Question

Hi, I apologize if this gets to be a bit lengthy. First of all I want to congratulate you on what you are doing here. Although I have not learned much halacha, I can still appreciate your counterpoint to the misapplication of halacha that is popular today. It seems that people can only find satisfaction in frumkite, maybe to make up for a lack of satisfaction in judaism. Or, as a friend of mine likes to say, it's a contest to see who can inconvienince themselves the most. Either way it is great to see the bold approach you are taking to counter the trend. Thank you. Now I have some questions that people keep throwing at me when I try to follow a reasonable approach to kashrut. I would appreciate if you could clarify the issues for me. 1) What is the answer to the knife issue. I commonly hear: They may have cut meat and then cut [blank] and then cut [blank] so it may be traif. Why isn't this true and where does the misconception come from? 2) Grape products (vinegar, grape juice) that are mevushal are ok but before they were mevushal they were by the goy. Why doesn't that makes them Assur? 3) The food may be OK but the Kailim are traif. What is the misconception? 4) Baked goods. They may use lard to grease the pans or they may use lard in the butter. Is this not true? 5) It may be owned by a jew and open on shabbos or bussar bechalav etc.. When are we choshesh for this? Thanks in advance. You may have answered these questions before but it is hard to search the whole site. I appreciate the time. -Nissan