I clean everytime they pee or poop. I spray chlorohexidine down and wipe it out best i can.

Sometimes with tubs you will notice if you dont catch it in time, the urates will harden in the corners and be hard to get off. And if you use an abrasive scrubbie it will only make it worse next time, since there will be groves for it to sink into.

I have few tubs i need to replace due to this but for mean tiem i just keep cleaning and scrubbing.