https://www.febasgcs.co.uk/services/treatment-and-stain-block/
Treatment and Stain Block in Luton & Bedfordshire | Professional Stain Protection
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https://www.tippers.com/products/polycell-trade-liquid-stain-block-1l-5077776-pollsb1l.html?filter_set%5B%5D=288,289
Polycell Trade Liquid Stain Block 1L 5077776 - Tippers - Builders Merchant - Building Supplies,...
Polycell Stain Block permanently covers a great number of different stains, such as nicotine, soot, rust, grease, ballpoint pen and lipstick.
stain block
https://www.homedepot.com/p/Linzer-5-in-Block-Deck-Polyester-Blend-Flat-Stain-Brush-3350-5/202061388?cm_sp=socialmedia%7Capronblog%7CD24%7C000000%7CSamRaimondi%7C121285
Linzer 5 in. Block Deck Polyester Blend Flat Stain Brush 3350-5 - The Home Depot
Use this Linzer Flat Stain Block Brush to remove scales from your projects. Features threaded plastic handle which accepts extension poles.