Poorly
Every single time my daughter sees my in laws she ends up poorly! They live in filth and I refuse to go there so they come to us but it can’t be a coincidence that every single time she sees them she’s got some sort of virus after!
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You could also pretend to have gone through a new "phase" of requiring all visitors to wash hands on arrival and see how that goes. Not making it personal to them. After one of my mums friends offered to let her shower at their place she accepted the offer from me. Don't clean out their house though unless they've asked for it and accepted they need to change or it will just be a waste of time
They don’t see no wrong in how they live and would never accept to shower etc, they’d rather slate me and not have a reputation with their granddaughter. My eldest son told them their house is disgusting and mil threatened to slap him for being rude!
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Sending hugs my parents are hoarders too while I can't say I can attribute illness to their visiting. Your partner will need to have a word with them to suggest therapy (it's a mental illness likely they believe how they live is normal and ok) and consider suggesting taking a shower at yours at the start of visit and offering to keep some clothes at yours so they can be fresh. Only if you're OK with doing the laundry and offering your bathroom though. And it will need to come from him. They will likely be super offended and refuse and then 2 years later ask if thr offer still stands