CanadianGran
My large sink is on an angle, so my cupboard is octagon shaped, with lots of room, but not easy to access the back.
We keep the garbage bin, cleaners and bin liners, plant food and watering can, and a bag for recycled plastic.
It gets a wipe down fairly often (because of the garbage bin), and a more serious clean out a few times a year.
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Mine is like that, too. I have installed little shelves to raise the bottles at the back and everything else is in a plastic crate. We used to have a tap that would leak occasionally so we have a water alarm down there which has proved very useful.
Rubbish bins are kept right at the other end of the kitchen (built in). I was fed up with people fiddling around my knees to get at the bin while I was at the sink. Also the bin is nearer the door that way, so quicker to empty it.
As bijou says, most specialist cleaning products are superfluous and under my sink many are not being replaced as they run out, instead I fill up any empty spray bottles with home made solutions.