Almost every damp-interior job we do in BS49 comes down to one of these four things.
Wet mats that never dry
You get in wet twice a day and the car never runs long enough to dry out. The mat holds it, the carpet underneath holds it, and by winter the whole footwell is damp. Extraction plus a proper dry fixes it; leaving the same mat in undoes it within a month.
Blocked pollen filter
A clogged filter kills airflow through the cabin, and without airflow moisture has nowhere to go. Worth checking before you spend money on anything else — it is a cheap part and it is the single most common cause we find.
Mould in the belts and stitching
Once it appears on seat belt webbing it is well established in the cabin. It needs steam and a biocidal clean rather than an air freshener, and the belts need doing on both faces to actually stop it returning.
A genuine water ingress
Occasionally it really is a leak — usually a scuttle drain or a door membrane. We cannot repair that, but we will tell you clearly if that is what we are looking at rather than valeting round it and taking your money.