How to get scummy residue off bath?

[WTF0ver]

Cleaning up rental flat before I hand over the keys and the bath has scummy marks which just won't shift so the bath us still looking grubby. Tried various shower products and textured cloths to no avail. What can I try that works? Bleach?

Thanks for any advice.

Fill the bath with hot water, add some bio washing powder and leave it overnight.
Should wipe off in the morning.

A magic sponge!

Thanks. I was thinking I might try dish detergent too. Can't believe how difficult that scum stuff is to remove.

It might be limescale, which then has dirt attached, so might be worth some descaler if you haven't already tried it.

Bleach

Cillit Bang line scale - leave it on for 30 mins

We got a shower cleaner, no scrub from Bargain Homes, my DD got it as it's on tictocs to clean your screens
On showers you just spray and walk away.
I thought yeah right that will work, but blow me down it does....

Thanks everyone, managed to scrub it away with carpet cleaner brush and bath cleaner. All sorted now!

Steel wool worked for me.