Picture the house as a dolls house, if you turned it upside down and it stays where it is, consider it part of the house (this was how my solicitor explained it when issues came up with the sellers for my home) and covered by the money you took out the mortgage for, it's not perfect - a wall mounted tv wouldn't be included unless specified, for example, but it's a good guide.
I'd refuse to discuss anything else until the loan is repaid; or if I didn't expect the money back, I'd offer to 'forgive' the loan, in exchange for a written agreement that ex has no claim to anything else (excluding child obv, and handmade items) in order to get it sorted with a firm line drawn under both the items disputed and the loan for my own peace of mind.
(Though I wonder - if ex was out of work for much of this time, I'd consider this ex's contribution to the household as much as covering the groceries/utilities/household bills... also the items are used so keep in mind 2nd hand value - I just wouldn't want to give ex that much time/mental space/attention by arguing the point -).
Handmade items of furniture (table, bed-frame, bookcase, and I'm not including flat-pack here) that ex made, ex arranges removal at a mutual convenient time within 30 days (by an insured 3rd party ex pays for if you suspect likely shenanigans such as 'accidental' damage to your property) - unless it's something for child, then because I wouldn't want it to come up again and again (and assuming shared custody where child would still have access at ex's), I'd replace within 90 days, and then ex arranges removal... etc etc. I'd usually say exclude anything that was made specifically for you as a birthday/anniversary/whatever gift, but I probably wouldn't want to keep them unless planning to hand down to child.
(Having made my own furniture, those items are much more important to me - so I admit a bias here - but I would certainly expect to keep my dining room table I made following a separation in the same way I'd expect to keep the household items I inherited from my family.)
Also, I'd give 30 days notice to collect abandoned personal items such as clothes before getting rid (otherwise it's effectively unpaid storage - would ex have paid for a storage unit for this stuff? I'm guessing no, and it's another hook into your life).