Ronseal Clear Preserver, preserves and waterproofs exterior wood. The 2 in 1 formula preserves and eradicates, protecting your investment against rot and decay. - 2 in 1 Preserves and Eradicates - Superb colour and preservation for long lasting protection - Preserves, preventing rot and decay - Eradicates, killing woodworm and protecting against re-infestation