You can put a dishwasher tablet in the toilet bowl at night and allow it to dissolve in the toilet bowl water.
Then the next morning give the water in the toilet bowl a good scrub around the bowl using the toilet brush to reach any stains and then flush the toilet.
You can also use Mr. Clean in the toilet bowl or even some vinegar an baking soda.
You can put a small amount of Mr. Clean in a toilet tank to keep the toilet tank and toilet bowl clean but too much of the Mr. Clean could damage the flapper and other internal parts and seal of the toilet tank.
Clorox bleach tablets also eventually damage the internal parts of the toilet such as the toilet fill valve, toilet flapper and seals over time.
So while the Clorox Bleach tablets can help keep your toilet tank and toilet bowl clean they can lead to premature failure of the toilet components which will require replacing sooner.
Putting Clorox or other products containing bleach in a toilet tank is not OK.
The use of Clorox or other bleach containing cleaning products when used in a toilet tank can corrode the internal parts of the toilet tank and can even deteriorate the toilet flapper, seals and the toilet fill valve.
Putting Clorox or bleach in the toilet bowl is okay to clean the toilet bowl but it should not be put into the toilet tank.
To clean the toilet tank you can use some white vinegar diluted with some water which is safer on the toilet parts.
Even the use of in tank toilet bowl cleaners can cause problems with the toilet flappers, seals and toilet fill valve over time.
To keep a toilet tank clean over time without damaging the internal parts of the toilet, add a cup or two of white distilled vinegar once a month to the toilet tank at night topping it off to about an inch from the top rim, then flushing it in the morning.
Vinegar is even safe for use in toilets on a septic system.
Vinegar is safe and milder than caustic cleaners designed for the toilet, and those commercial cleaning agents can eat away the good bacteria in your septic system.
To safely and inexpensively clean your toilet bowls, pour a generous amount of vinegar, followed by a heavy sprinkling of baking soda, into the bowl.