It's sat in a bag for a few years in a garage which is what made me think of just selling it all since I never used it. Which is why I've been explicitly telling everyone "this may smell, give it a wash".
I honestly think a wash and it'll be fine, but in the unlikely event that it doesn't fix it, and you're not happy, then we can talk about refunds and stuff, totally happy to do that.
Give it a go and get back to me?