Toilet cleaning

Yes, I have just used normal toilet cleaning supplies in all our RV toilets, both plastic and porcelain, without any problems.

If you use liquid dish wash detergent to clean the toilet bowl, don't use too much like I did. When I emptied the black water at the dump station, bubbles, millions of bubbles came over flowing from around the hose! Took a lot of water to wash the area down. On the bright side, at least it was clean for the next camper!

I flush but don't refill the bowl.
Give a good shot of liquid dish detergent in the bowl, then fill with water,wait a few seconds then flush the sudsy water down .
For stubborn stains or rings leave the soapy water in the bowl till the next use.
No fuss no muss or nasty brushes to stink or clean.
Good Luck, Mike

Porcelain or plastic toilet?

If plastic a good coat of automotive paste wax after cleaning keeps things from sticking to sides.
If you use a formaldehyde based holding tank chemical is would be safest NOT to use a bleach based cleaner a possibility of noxious fumes being produced not a great risk but a possibility

Ask my wife, I've never done it...
Seriously, whatever you use at home you can use in your RV.