Clean cast iron pot and pans with salt. Iron cookware is seasoned with oil before first being used. Cleaning with salt means this seasoning/cure is not ruined and need not be reapplied.
Clothes irons can also be cleaned with salt.
The tracks on sliding doors and windows can be cleaned with vinegar.
A mattress can be cleaned with baking soda. Sprinkle it on the mattress and leave it for several hours. Then vacuum. A mattress protector and an UV light wand are also recommended.
Venetian blinds can be cleaned with an old sock. Put the sock on you hand like a glove and run the slats of the blind between your thumb and first finger. Add a little vinegar if you wish.
Clean light globes and fittings with a soft paintbrush.
Bicarbonate of soda, made into a paste, will clean many surfaces, including wooden doors and bench tops.
Clean a showerhead with vinegar in a plastic bag. Fill the bag partway with white vinegar, and then tie it so that the showerhead is soaking in the liquid. Leave this for a few hours, and then rinse with cold water for a minute or two.
Canned air (an aerosol can) is useful for cleaning tight corners and hard to reach places.
Wax paper can clean faucets.
Cream of tartar is good for cleaning stainless steel items like toasters.
Affix a cloth to a chopstick or wooden spoon to clean between dual layers of glass.