There are a few simple home-brew recipes like white vinegar or borax and lemon juice but these brews have added value in terms of chemistry, concentration and the addition of thickeners to make the cling to the treated item. Nothing to stop you using the traditional stuff while you wait for these to arrive in the post!

• Prepare seized fasteners for loosening.

• Buy enough to be generous.

• Buy non-toxic particularly if you own pets.

• Buy non-flammable if available.

• Always wear eye-protection

• Always wear dermal-protection