Litter tray liners: for or against?
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Just a quick tip – don’t use the green scouring side of the sponge to wash the litter tray. You want to avoid scratching the plastic surface so it stays non-porous and the tray lasts longer.
Another issue with litter tray liners is that they don’t allow the litter to absorb urine properly; they don't actually make cleaning any easier and they don’t protect the inside of the lid either.
To keep the litter liner in place, all you need is a good elastic band... 🙄
Mind you, that doesn't solve the issue of the cat clawing holes through it.
TOP TIP: I use boxes that aren't actually sold as litter trays – they're the Samla bins from IKEA.

They cost less than £2.50 each, so at that price, once it’s worn out I'll just bin it and buy a new one!
I realise this might not help those who use hooded trays with a flap, but I actually have a piece of furniture that's been specially customised for my cat's litter tray, so I don't need a lid...
That's exactly what I was worried about with the vinegar, but after a proper rinse and letting it dry outside in the fresh air, the smell vanished and didn't bother my cat at all.
Personally, I don't bother with it because I find it's easier and less of a faff not to.
Initially, I used white vinegar (it's the most effective thing for limescale). The result: my cats started going outside their trays because they couldn't stand the smell of the vinegar, which really lingers even if you rinse them well—that's why I use hydrochloric acid now.
Anyway, as I mentioned, thanks to the leaflets I put at the bottom of the trays, if I have to descale them once a year, that's the absolute most.
Hydrochloric acid?! Vinegar is just as effective, easier to get hold of and less harmful!