Here are some of the best DIY cleaning products tips I found on the net. You can find more here, here, here, here and lots of green clean ideas here. This page is also a great resource for making laundry detergent.
Cornstarch
works well as a window cleaner, furniture polish and as a carpet cleaner and deodorizer. This mixes with many things without toxic results.
Lemon juice
another highly acidic liquid, works extremely well on hard water stains and on built-up soap scum. You can mix lemon juice with vinegar and/or baking soda to make a paste similar to Soft Scrub brand cleaning scrub or mix it with olive oil for a wood furniture polish. Lemon juice left to sit on a rust spot can completely erase the rust and hard water. This may need to be repeated several times before the spot is completely gone.
Club soda
is a great stain lifter for fabrics and can double as a glass cleaner. When using club soda as a stain lifter, allow it to soak into the stain before blotting. Do not rub the stain or you risk smearing it around.
Rug and Upholstery Cleaner
Sprinkle corn meal, baking soda or cornstarch on dry rugs and vacuum. Use club soda or soap-based rug shampoo.
Mix together: ¼ c. vegetable oil-based liquid soap
3 tbsp. (or more) water
Whip ingredients in bowl with egg beater. Rub foam into problem areas of the rug. Rinse well with water.
Mildew Remover
Dissolve together: ½ c, vinegar
½ c. borax in warm water.
Apply with sponge or spray bottle.
