My main tips are washing related:
Instead of fabric softener use the same amount of the clear/distilled malt vinegar. The clothes will come out smelling fresher (not at all of vinegar), won't get a funny musty smell if they are stored for a long time and towels stay much fluffier and more absorbant. Its also much better for your machine.
For whites and very lights:
Use washing powder (not liquids) and add in 1/4cup of soda crystals. They will be so white they'll practically sparkle. This will also help re-whiten any whites that have gone a bit grey.
For coloureds and darks use washing liquid (not powder) - it will keep them brighter.
Berry stains on whites and lights will come out without a problem if you soak in a soda crystal solution for a shirt time before washing. (1yr old DD has really put this to the test with blackberries, blueberries, raspberries and strawberries).
If your washing machine has a build up of residue (won't happen if you wash as above), do a boil wash with 1 cup of soda crystals in the drum. Then do a boil wash with 1 cup of clear/distilled malt vinegar in the drum. Machine will be like new again - I even revived an old machine that seemed to be on its last legs, it wasn't washing properly and was putting dark marks on clothes.
If you have old towels that have lost their absorbancy, look a bit grubby/mucky even when washed: put them in a boil wash with 1-2 cups of soda crystals in the drum. Then put them straight in another boil wash with 1-2 cups of clear/distilled malt vinegar in the drum. This will strip all residues off them, not only making them look new again but also making them super absorbant again. It will also clean your washing machine.