Thank you so much everyone for your suggestions and commiserations - was a bit worried about posting in case Tattle just thought I was a smelly article 🫠
@Snippysnips yes that's what it is! Might have to try those - my partner is a bit worried that they might stain or damage clothes though, have you had any issues?
@peekachu same - it's quite alarming

following a below comment we may have to upgrade it - ours was a bargain purchase from Aldi a couple of years ago so not sure how energy efficient it is. We do the same - smallest room, whack the heating on for a bit and shut the door with the dehumidifier on- but the heating is so expensive we could do without it :/ that's good to know that they're designed to be on for a long time cos I was genuinely worried it might blow up! We've tried washing on 40 too, I think over the last couple of months all our washes have been 40 rather than 30. I reas that's recommended for sportswear to get the sweat out but somehow my regular daywear t shirts are still coming out just as sweaty as they went in.
@anything at all the machine does smell a bit too! It's bizarre - i saw a tiktok recommendation to scrub the inside with washing up liquid and a sponge then do a 30 degree rinse, so did that, then used proper dettol washing machine cleaner for a cycle on 60, and it still smells a bit off. I was in a meeting yesterday and was so paranoid my clothes were smelly :/ I'll look into some laundry sanitizer - what brand do you use? I've just searched my postcode and found our water varies from soft to moderately hard (whatever that means) so maybe the white vinegar is worth a go too... hmmmm.
@saltandvinegarcrisps no I haven't, maybe that's the trick I've been missing! I'll have to have a look on YouTube and see if there's a decent how to guide because I wouldn't have a clue what I was doing. Thank you for the suggestion! That's a nightmare - has replacing them all helped? Our washing machine is a freestanding one in the kitchen and I try to leave the door open all the time but it's in a bad position - definitely stays open a couple of hours after use though.
@PineappleQueen19 thanks so much for this - ours was a cheap Aldi bargain so reckon we're definitely paying more over time. That one you've linked looks really good - will talk to my partner and see if we can stretch to it. Definitely seems like it'll be a well-used purchase!
@Clickbait omg don't be daft, laundry issues are all relevant here

that sounds horrible! I have no suggestions as everything you've tried sounds great to me but I'm sure someone else will.