Yes, you can re-sand solid wood; take care with veneer so as to not go through it. Sand enough to rough it up and stain again, there's no need for conditioner. Keep a fast, even pace. Rag quickly with gel stains, use a foam brush for others.
I believe you're asking about the "Distressed Look' when Antiquing furniture. What I suggest is that you take a dry rag and dip it in Vaseline or Petroleum Jelly and...
Sure! You could add scented lotion or perfume. You could also use essential oils but make sure you like the smell you're adding into your slime. I would suggest only...
It may still come out over time. Also, you can try looking online for a cleaner specially designed for that. I have cats too and have been using a hard...