Last night OH went through to the kitchen and noticed a puddle on the floor just under a cupboard to the left of the sink. He asked if the sink was leaking, I went through and said no (it used to leak but ran down the floor directly under the sink due to the run in the floor), got some kitchen roll and mopped it up and it was cat pee

It was about a metre away from the litter tray.
I then came through this morning and it was there again, went through again before I took the dog out at about 10.15 and there was nothing there but was another puddle when I got back from our walk. All in the same place.
I'd understand if the litter tray was dirty but it wasn't - I'd only just cleaned it out about an hour or so before the pee arrived on the floor last night and there was nothing in the tray when I found the pee. I've cleaned that area of the floor each time but I'm guessing whichever cat it is can still smell it and is continuing to go there. What is best to use to clean it?
I don't know which one it is as I haven't caught them yet but I'm guessing it is Spencer as he was quite quiet last night after we found the initial puddle and didn't really come for any cuddles (very unlike him), he just sat under one of the chairs in the kitchen and when he did come through to the living room he was sat in the corner looking at the wall

He is still eating like a horse though and getting very excited when the food comes out the cupboard.
He seems to still be pooing in the litter tray though? Well I'm guessing he is as there was 2 poos this morning when I got up and another 2 when I emptied after been on a walk and there's no way Skye could have all those poos.