Cat is suddenly drooling?

Hi all need some advice please! My cat was unwell a few days ago, I think he licked some bleach from his paws from when I mopped. He's since back to normal but now he's drooling which is really random. Hes never done this before. He's eating and jumping around like normal. He drools when he's resting, so far that's the only times I've seen it. His teeth are also fine and cleaned regularly.

He does go outside and they've recently mowed the grass and I wander if he's been eating something toxic or if the bleach is affecting him now?

Not sure if I should get this checked if it's just his drooling that's an issue and he's otherwise fine. The vet bills are extortionate and I can't really afford it. Any help appreciated!