How can you get rid of stains on the toilet seat lid?

Some bleach and a good scrubbing should do the trick! Good luck!

Peroxide

well I have used a lot of cleaners and I will be honest the finish on a toilet lid is very touchey I ended up covering mine and decopaging over it ...and it added some cute touch to my bathroom,

Try a magic eraser and baking soda

Is the lid plastic, wood, or something else? Material of the seat/lid will dictate the cleaner.

Blood is a protein stain and notoriously hard to remove.

Hydrogen peroxide is fairly mild and ok for most surfaces. (Protect yourself and other surfaces - it has a bleaching action.) It’s inexpensive and available in drugstores and large grocery stores in the first aid supplies.

How big are the stains?

Could you incorporate the stain(s) into a decorative pattern? Decals. Paint. Decoupage? Old-fashioned 1940s toilet lid cover?

New seat/lid combinations are available in a wide price range and very easy to install. There are two sizes, regular and elongated. Measure the bowl from back to front Before you shop.

Rubbing alcohol or hydrogen peroxide should do the trick.

Great options. Will give it a go. Many thanks

You can try Cerama Bryte. If it doesn't work, replacing the seat is easy. https://www.exquisitelyunremarkable.com/2021/06/how-to-replace-a-toilet-seat.html

Hydrogen perxiode and baking soda make a poor man oxy clean.

The dollar stores called Awesome it is the equivalent to Oxyclean at a much better price, follow package directions.