Everbuild 404 fungicidal wash is a powerful fungicidal wash for the removal of lichens fungi and algae on all mineral surfaces such as walls paths roofs drives etc it is effective on most surfaces and also leaves a residual surface to help prevent further infestation features internal and external use fast acting leaves a residual surface to prevent future infestation powerful formulae registered with hse under control of pesticides regulations 1986 hse 7183 kills mould caused by damp on