How often do you clean your tank(s)?

I probably clean mine once a week when I do my water changes. Use a gravel vac even with sand to get the debris that is just on the surface of the substrate.

I probably clean my tanks like once a month when doing a huge water change

Minor cleaning weekly during water changes, bigger cleanings monthly

When I had my fish tank I would always do small water cleaning weekly without fail, I had myself in a routine where I would do it at the same day every week so that I knew it would be clean and I would not have any issues. Major cleaning such as completely changing all the water out and cleaning everything within it I would do once a month. I found that this would help keep my tank clean and free from any issues that would arise if I was to leave it any longer.

Initially I was cleaning only once a month but over time I have to clean it more often as the number of fishes have increased and probably my tank also looks old. It gets stained soon and my frequent scrubbing has increased the rate at which my tank gets stained.