How do I get this off!?

This shower is OLD. We have hard water and I've used everything I can think of to get these stains off but nothing works. Does anyone have any secrets they can share?! The yellow staining (obviously)

My house is clean but how do I get rid of the demon?

Dr. Bronner's Castile soap.

How to remove marks on MDF table?

I hosted a girls night where we painted candles using tea lights and I noticed these markings under the table cloth on our dining table.. is there a way to get them up? It’s a pool table convert with a MDF lid, I had our table cloth and then a pink fabric table cover over AND each girl had a placemat for their tea lights ( I’m tempted to take a steamer to it with a cloth underneath to see if it’ll come up but all purpose cleaner didn’t do the job. SOS