Toyo Sash

• ▸Country: Japan
• ▸Peak market share: 30%+ of domestic Japanese aluminium building materials
• ▸Current status: Absorbed into LIXIL Corporation (2011)
• ▸Primary material: Powder-coated and anodised aluminium
• ▸Building stock: Present in Japanese commercial and residential buildings from 1960s to 2000s

• ▸Commercial aluminium curtain wall
• ▸Residential aluminium sash
• ▸Entrance and shopfront systems

The age of Toyo Sash installations is the primary variable. Systems from the 1970s and 1980s may use anodised aluminium finishes - less common in modern systems but widely used in Japanese commercial construction of that era. Anodised frames require pH-neutral products and no abrasives. Toyo Sash's dominant market position in its era means their systems were installed across every building type. Quality ranged from basic residential sash to high-specification commercial curtain wall. Identify which type you are working on before selecting your approach.

This is how I clean Toyo Sash windows. The tools and technique below come from 25 years of daily professional work on the glass. Every step has been tested on real installations and adapted specifically for Toyo Sash systems.

• ✕Do not use alkaline or acidic cleaners on anodised Toyo Sash frames
• ✕Do not use abrasive pads on any finish type
• ✕Do not pressure wash into seals on aged Toyo Sash commercial installations

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