We have 2 indoor cats, who are usually shut up in our utility while we are at work as they can't be trusted not to ruin our furniture (utility is decent size, no window, but extractor fan). They use a covered litter tray with wood pellets which is cleaned regularly (poos as soon as we are aware, wees usually every morning). However there is usually a bit of a lingering smell between the litter tray and cat food. I think it's probably mostly a wet litter smell (Although not like fresh urine as I can sniff that out instantly) but wondered if there were any suggestions for how to keep it fresher? For example this morning litter tray cleaned c.7am, I came home about 1pm as this smell is lurking. One of the cats does sometimes pee outside the litter tray (in sink, randomly on surface recently) so I did wonder if one of the special pet odour sprays would help clearing that up than our usual antibac spray etc.