Have I wrecked my toilet?

[Grrls123]

Have I wrecked my toilet. I rented my home for 6 months and when I returned the toilet was extremely dirty. Someone told me to use caustic soda and then scrub the toilet bowl. Now I have black lines where Ive done the scrubbing. Does that mean that the caustic soda has wrecked the porcelain? Is there anything I can do. Ive now read these other posts and will never use it again!

 

[Deleted member 120897]

I suppose you could try bleach?

 

[king of pipes]

Quite possibly ? caustic soda is a powerful drain cleaner and not a toilet cleaner there are more user friendly options I'd try a slightly abrasive type cleaner Google "the pink stuff " great for cleaning enamel baths and sinks if that doesn't work then its goosed ☹️I'd say . Kop

 

[WC1]

Any pictures?
Any brass fittings on brushes used will leave black / grey marks