Working a section at a time use a damp microfibre towel to work the cleaner in ensuring not to over wet the headlining.
Work your way from each corner of the headlining towards the middle cleaning all areas as any areas left untouched may leave a water mark.
Spot clean any stubborn stains by reapplying the cleaner directly and working in thoroughly with the microfibre towel.
This step is not essential as the headlining can be dried to an acceptable standard with a dry microfibre towel. It is also not advised if your headlining in in an older, or weaker condition.
Vacuuming the headlining though, can effectively remove the moisture and leave it almost fully dry. This is achieved using a crevice tool attachment.