How can I remove ring around the tub. New home for me so stains are ol

I assume you meant old. Here is a link that will help.

https://www.google.com/search?q=getting+old+stains+out+of+tub&rlz=1C1BLWB_enUS700US700&source=lnms&tbm=vid&sa=X&ved=0ahUKEwjVidixgefYAhUS8GMKHX5cB_EQ_AUICygC&biw=1422&bih=684&dpr=1.13

TSP is a miracle cleaner. WalMart carries it. USE GLOVES!!! THIS IS A STRONG CHEMICAL, but really cleans. Scrub the stain with it. If its still there, make a paste of baking soda and hydrogen peroxide. Make it thick enough to stick to the stain and leave it for a couple of hours. In fact, I would try this before the TSP just to see if that works first!

https://www.rd.com/home/cleaning-organizing/6-household-items-for-a-sparkling-bathtub/

Easy Off No Fume Oven Cleaner in the BLUE can. Spray it on and let it liquefy. Rinse well. May need some scrubbing. Wear rubber gloves. Works on enamel, porcelain, and fiberglass.