Specify dimensions and sides
Provide width, length, mattress type, marks and whether one or both sides need attention. Toppers and protectors are separate items. A zip does not automatically mean the cover can be machine washed.
Control moisture
Manufacturer instructions take priority. Wet treatment may be unsuitable for sensitive foams or particular covers. A dry-feeling surface does not prove the core is dry. Bed use should not be planned around a universal number of hours.
Realistic expectations
Cleaning is not medical treatment or a guarantee against allergies. Deep urine contamination, mould or permanently altered materials cannot always be resolved by cleaning. Discuss the cause and possible alternatives before treatment begins.