A blended, silicated alkaline cleaner for use in superior, non-foaming, alkaline immersion cleaning applications. The cleaner does not contain any environmentally unfriendly detergent compounds. It is used at between 40° and 80°C, and is suitable for all metal surfaces. It meets the requirements of UK Def Stan 03-2. It is being assessed against Boeing BAC 5763 Type II and SAE AMS 1537.