Can anyone advise me the best way to prevent mildew forming in the inside of the hood.
Also the best cleaning product
King regards[*-)]
To stop mildew from appearing, check all your drains are clear, or that there isn 't some undelying leak into the boot etc.
If you have mildew; a dilute solution of bleach, followed by water, repeated a few times, should ensure that the fungus is killed off. It might take a few treatments. Some also get good results using a bathroom mould remover. If the car is left unused for long periods, invest in a dehumidifier, or get some dessicant material (eg. silica gel crystals).