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Clear Chimney Services


Office: 0845 61 999 51   Installations & Sweeps: 07852 862009


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Registered Office: 90-92 High Street, Evesham, Worcs. WR11 4EU.  

Types of Creosote


A common misconception when burning wood is that all creosote is the same and that after a period of time you'll have enough to brush.  Actually, given half a chance, a fireplace or stove is self cleaning and theoretically if the proper burning procedures are followed a flue can go without ever needing a cleaning as the creosote will burn off into the atmosphere.


In total there are three levels of creosote: 1st Degree, 2nd Degree, and 3rd Degree creosote.  


1st Degree is a light, fine powder that tells us the system is burning well.  1st Degree can be cleaned without issue.

2nd Degree is a clumpy creosote that is still able to be cleaned but tells us that something is not right in how the fireplace/stove is operating and that we should start looking at a remedy before it turns to third degree.

3rd Degree creosote is incredibly hard and dense as it forms in layers upon layers.  It is so hard that it can not be cleaned with conventional tools.


Cre-Away™ - How it works:


Cre-Away™ is a four component powder that safely and effectively modifies glazed or 3rd Degree creosote so that it can be more easily removed by chimney sweeping.


Firstly, a reactive agent neutralises the slightly acidic creosote making it less corrosive to metal components and less flammable.


Secondly, a dehydrator absorbs the oils and moisture contained in some forms of creosote. Combustion inhibitors also help to reduce the chance of a chimney fire.


Finally, a magnesium catalyst helps break down 3rd Degree creosote when the flue is heated by normal use.


The time it takes to chemically modify third-degree creosote with Cre-Away™ will depend on many variables such as:


Type Of Wood Used.

Moisture Content.

Burning Habits.

Air Flow.

Flue Size.

Amount Of Existing Build-up.


In some cases reaction time is fairly fast, within a week or two. Other more difficult build-up problems may require regular use and multiple cleanings during the heating season to completely modify the existing 3rd Degree creosote.


When a cleaning is needed for a system, 9 times out of 10 it can be completed from the inside of the home / bottom of the flue. We put down drop clothes to protect the house and furniture and we use a 4 stage filtration vacuum to control any dust that comes back down the flue during brushing.


Not only do we brush the flue, we also brush the firebox, the damper, the smoke-rise, and we clean out the smoke shelf of ash, creosote, and debris.



For Wood Burning Stoves and Fireplace Chimneys.

Tough to remove glazed

3rd Degree creosote on

a clay liner.

Removal of modified

glaze by chimney


The same liner after glazed

creosote has been modified

by Cre-Away™.

The same liner with

Cre-Away™ applied.

Creosote and soot build-up in your fireplace or wood stove chimney can be a fire hazard if your chimney system is not properly cleaned and maintained. Occasionally wood stoves and fireplaces can produce a tar or glaze called 3rd Degree creosote.


3rd Degree creosote is nearly impossible to remove by regular chimney sweeping. Cre-Away™ modifies 3rd Degree creosote by converting it into a more brittle state that has a different expansion / contraction rate than the flue it is attached to.


During heating and cooling cycles the treated creosote loses it’s adhesive properties so it can be more easily removed.


Every fireplace is as individual as it’s owner. Please contact us to arrange for a survey and quote.