Accidents happen. Wine, blood, pet urine, crayon, markers, etc. Cleaning tech seems to have evolved quite a bit. Perhaps it might be nice to have an updated thread with "what are your current favorite cleaners for different issues?
For us, Biokleen was a great addition. Thank you to whomever suggested it. It seems to work well for cat urine, which can be a real challenge (not the guest stay - we have 2 cats).
So far, Tide HE / Shout, has taken care of bed linens.