* Mould - Use pure vinegar and spray it on. If you want to keep mould from growing, use a diluted vinegar and spray it on a regular basis.
* If you have rooms that have too much moisture an are prone to mould and mildew, leave out bowls of clean kitty litter. It will soak up the exess moisture. If you have cats, put said bowls out of reach.
* To get rid of grime in your tub/sink, cut a lemon half, sprinkle salt on it, and it's a natural abrasive. Scrub with the salted lemon and then rinse clean.
* Window Cleaner - 1/3 tsp liquid castile or other liquid vegetable based soap, 3 tbsp cider vinegar or white vinegar, 2 cups water Mix in a spritzer bottle.
That's all I can think of at the moment. I'll be back tomorrow with more.