In Lancashire, a proper pint is a point of pride. From a velvet-smooth mild in a Burnley back street to a hazy citra IPA in a Preston taproom, the beer is only as good as the line it travels through. Cleaning beer lines is not glamorous, but it is the difference between a pint that sings and one that tastes of vinegar, fustiness or last week’s stout.

Why line cleaning matters in Lancashire’s beer scene

Beer lines are warm, dark and moist — ideal for yeast, bacteria and mould. Every time you pour, sugars and proteins coat the inside of the tube. Left alone, that film turns sour and can taint even the freshest cask ale or craft keg. In a busy Lancashire pub, a line might see dozens of pints an hour. Without regular cleaning, the first pint of the day can taste dull, and the last can be downright unpleasant.

Real ale is especially vulnerable because it is a living product. Craft beer, with its hops and fruit additions, leaves behind sticky residues. Cider is acidic and can leave a different kind of deposit. Soft drinks are sugar-rich and attract mould. Hot drinks machines have milk lines that need their own attention. Home brewers face the same enemy in miniature: biofilm.

How often should you clean?

Industry guidance in the UK generally recommends cleaning beer lines at least once a week, and more often if you serve cask ale, real cider or unfined craft beer. Some high-turnover venues clean every three to four days. If you notice off-flavours, fobbing, or a smell from the tap, clean immediately.

• Weekly: standard keg and cask lines.
• Every 3–4 days: real ale, cider and heavily hopped beers.
• Daily: flush soft drink lines with water, and clean hot drink milk lines.
• After every keg change: flush the line with clean water.

The line cleaning routine, step by step

You will need a line cleaning kit: a pump or pressure vessel, food-grade line cleaner (usually caustic or acid-based), a bucket, spanners, and clean water. Always follow the chemical manufacturer’s dilution and contact times.

• 1. Isolate and drain. Turn off gas, disconnect kegs, and drain beer from the line into a bucket. Do not save it.
• 2. Flush with water. Push clean water through until it runs clear.
• 3. Add cleaner. Mix according to instructions. Pump the solution through the line and let it dwell — typically 10–20 minutes for caustic, longer for stubborn deposits.
• 4. Brush and scrub. Remove tap spouts, clean them with a small brush, and soak in cleaner.
• 5. Rinse thoroughly. Flush with clean water until no chemical smell or residue remains. Test with pH strips if you have them.
• 6. Reconnect and purge. Reattach kegs, pull through until beer runs clear, and check for leaks.

Never mix different cleaning chemicals. Never leave caustic cleaner in the line overnight unless the product is designed for it. Rinse until you would happily drink the water.

Cider, soft drinks and hot drinks

Cider lines need the same routine, but cider can leave a tougher mineral deposit. Use a cleaner suitable for acidic beverages and rinse extra carefully. Soft drink lines — cola, lemonade, tonic — are sugar bombs. Flush them daily with water and clean weekly with a food-safe sanitiser. Mould loves the dispensing nozzle, so remove and soak it regularly.

Hot drinks machines are a different beast. Milk lines, steam wands and boilers need daily flushing and regular descaling. In a Lancashire café, a dirty steam wand can scorch milk and ruin a brew. Use dedicated milk line cleaner, and never let milk sit in the line between services.

Home brewing: clean, sanitise, repeat

Home brewers in Lancashire often start with a kit and a bucket. The same rules apply: clean first, sanitise second. Beer lines in a home keg system — whether corny kegs or a kegerator — should be cleaned after every keg. Use a dedicated line cleaning bottle or a small pump. For bottles and fermenters, use a no-rinse sanitiser and avoid scratching plastic. Biofilm hides in scratches and threaded joints.

If you brew real ale at home, treat your dispensing line like a commercial one. A weekly clean will stop your hard work tasting of vinegar.

Records, training and common mistakes

Keep a simple log: date, cleaner used, contact time, who cleaned. This helps you spot problems and proves due diligence. Train every member of staff who changes kegs. Common mistakes include using too little cleaner, not rinsing enough, forgetting the tap spout, and cleaning only when a pint tastes off.

In Lancashire, we care about our beer. A clean line is a mark of respect for the brewer, the publican and the drinker. Whether you are pouring cask mild in Ormskirk or a craft lager in Lancaster, the routine is the same: flush, clean, rinse, repeat. Do it properly, and every pint will taste as fresh as the first.