you need an enhancing sealer

that is what prevents browning

and more with pressurised cleaning systems

Deostor or Odourtak - which one

Actichem CTR 500ml spray Base UOM:500ML you need an enhancing sealerProduct Overview Actichem CTR is a high activity formula for neutralising and removing coffee and tannin stains. It is a blend of sodium metabisulfite and specialist low pH compounds selected to break down tough tannin staining, coffee marks, cellulosic browning, water marks, and many dye and beverage stains. CTR is a reducing agent, not a bleach. It works by chemically reducing the stain molecule so it no longer reflects colour, rather than by