Quote:
Originally Posted by rabbithorns 
White is not the natural color of cotton. Cotton is heavily bleached before making into clothing. It is actually natural for "whites", such as t-shirts, to revert to a more yellow color. Cotton is either slightly yellow, slightly green, or slightly tan, right out of the boll. You can bleach but eventually it won't do any good because the fabric will be breaking down by the time you can't get them white anymore.
If you want white things, buy new when they go back to their natural color. The detergent doesn't make much difference, although I suspect the more harsh it is, the shorter the honeymoon-white will last.
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It can't 'revert' back because it is no longer alive. It's like bleaching hair. Once bleached, there's no reverting back to anything. Bleaching makes cotton (& hair) porous, so it's much more likely to pick up colors from the environment, like minerals in water, soap buildup, etc.
Dingyness is caused by build up of minerals and/or soap residue. This is much more likely to occur if you have hard water, even if it's just slightly hard. Hard water makes is difficult for soap to fully wash out & has minerals that build up on stuff. So if any of your faucets have a light grey/yellow buildup, it's due to the minerals in the water.
How to get them undingy? Bleach or Oxiclean. You need something to strip out the build up. You can also try RLR. It's a laundry additive in the laundry aisle. It helps to dissolve away the build up of soap & minerals.
As far as natural vs. Tide, there's no difference. If you have hard water, add in a cup of baking soda in the drum and a cup of vinegar in the rinse cycle. Both soften the water, and the vinegar helps the soap to wash out. Make sure not to use too much soap, esp if you have a front loader. In fact, a tbs of detergent in a front loader is more than enough to clean dirty clothes.
A once a month treatment for the whites will keep them undingy. Just fill up your machine with super hot water, throw in a cup or two of oxiclean (or a 1/2 c of bleach for a toploader), throw in your clothes and let it agitate a bit. Then turn of the machine and let it soak for 6 hours for oxiclean (it's hydrogen peroxide and it's only active for 6 hours), or overnight for the bleach. Then run a regular wash with some detergent and another empty wash to get rid of the majority of the bleach/oxiclean. Your whites should sparkle!
hth!
Ami