I'v got mould on the head lining of my car any tips on how to clean it off

What I would try is warm water with a little bit of bleech. Apply with a sponge. Be careful and wear protective gloves for your safety.

enzyme cleaner such as bio brisk

Autodetailer said:

enzyme cleaner such as bio brisk

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That's just reminded me another thing you could try is some biological washing liquid dilute in warm water. Yes the stuff you use to wash your cloths and because it's biological it has enzymes, might be a bit cheaper than buying bio brisk? Enzyme cleaners shouldn't be used on wool or silk but I doubt this will be a problem on a headliner as it's likely to be polyester derivative.

By using a light mix of bleach it should also also kill the spores off an prevent mould coming back. However if you car is going mouldy you might want to give it a thorough clean throughout because mould could be lurking elsewhere unseen.

As ever always test for colour fastness before applying anything to material.